I thought the different TS exp potions stacked?

[Twyferd]

So, I've been leveling up my Sage, and have been using the different Draught/Draft/Drink of the Skilled I've /claimed over the years whenever I run out of vitality.

I've heard from many that these potions will stack if used concurrently, but I really hadn't noticed a change in exp gain when using more than one type at a time, so I decided to log my exp gain without and with the different types of potions, and here's what I found:

Time     Item made              exp %   Notes                    EXP Gain3:24pm   START - lv59 Sage      13.00%  With 1.1% Vitality 3:25pm   Wrath of the Grey      16.70%  Vitality Over            3.70%3:26pm   Vicious Torment        18.90%  No vitality              2.20%3:27pm   Unyielding Benediction 22.40%  No vitality, 55% potion  3.50%3:29pm   Umbral Attendant       25.90%  No vitality, 55% potion  3.50%3:30pm   Solar Flame            29.40%  No vitality, 55% potion AND 39% potion 3.50%3:32pm   Scourge of Shadows     32.90%  No vitality, 55% potion AND 39% potion 3.50%3:33pm   Sandstorm              36.40%  No vitality, 55% potion AND 39% potion 3.50%3:34pm   Ruthless Invocation    39.90%  No vitality, 55% potion AND 39% potion 3.50%3:36pm   Ruinous Anathema       43.40%  No vitality, 55% potion AND 39% potion 3.50%3:37pm   Killing Swarm          46.90%  No vitality, 55% potion AND 39% potion 3.50%3:39pm   Judging Smite          50.30%  No vitality, 55% potion AND 39% potion 3.40%3:40pm   Fiery Convulsions      53.80%  No vitality, 55% potion AND 39% potion 3.50%3:42pm   Fiery Annihilation     57.30%  No vitality, 55% potion AND 39% potion 3.50%3:44pm   Dire Invective         60.80%  No vitality, 55% potion AND 39% potion 3.50%3:46pm   Deathly Coil           64.30%  No vitality, 55% potion AND 39% potion 3.50%3:47pm   Chilling Inquest       67.80%  No vitality, 55% potion AND 39% potion 3.50%3:48pm   Brainburst             71.30%  No vitality, 55% potion AND 39% potion 3.50%3:49pm   Umblar Mettle          74.60%  No vitality, 55% potion AND 39% potion 3.30%3:51pm   Thwart                 78.00%  No vitality, 55% potion AND 39% potion 3.40%3:52pm   Symbol of Naltron      81.40%  No vitality, 55% potion AND 39% potion 3.40%3:53pm   Spirit of the Hunt     84.70%  No vitality, 55% potion AND 39% potion 3.30%3:54pm   Seismic Terror         88.10%  No vitality, 55% potion AND 39% potion 3.40%3:55pm   Portent                91.40%  No vitality, 55% potion AND 39% potion 3.30%3:56pm   Malevolent Efflux      94.80%  No vitality, 55% potion AND 39% potion 3.40%3:57pm   Infernal Cloud         98.20%  No vitality, 55% potion AND 39% potion 3.40%3:58pm   Incapacitate            1.20%  No vitality, 55% potion AND 39% potion 3.00%4:00pm   Holy Redoubt            4.40%  No vitality, 55% potion AND 39% potion 3.20%4:01pm   Harrowing Silence       7.00%  No vitality, 55% potion AND 39% potion 2.60%4:02pm   Foretelling             9.50%  No vitality, 55% potion AND 39% potion 2.50%4:03pm   Ferine Vim             12.10%  No vitality, 55% potion AND 39% potion 2.60%4:04pm   Fanatic's Faith        14.70%  No vitality, 55% potion AND 39% potion 2.60%4:05pm   Ess. of the Great Bear 17.30%  No vitality, 55% potion AND 39% potion 2.60%4:14pm   39% potion wears off   4:15pm   Drain Thought          19.90%  No vitality, 55% potion  2.60%4:16pm   Dazzling Array         22.50%  No vitality, 55% potion  2.60%4:17pm   Constrict              25.10%  No vitality, 55% potion  2.60%4:18pm   Consecrated Aura       27.70%  No vitality, 55% potion  2.60%4:19pm   Confoudment            30.30%  No vitality, 55% potion  2.60%4:27pm   55% potion wears off   4:28pm   Calcify                32.00%  No vitality, no potions  1.70%4:30pm   Aspect of the Hawk     33.60%  No vitality, no potions  1.60%4:32pm   Wild Salve             34.20%  No vitality, no potions  0.60%4:38pm   Sylvan Streams         35.20%  No vitality, no potions  1.00%4:40pm   Sunstrike              36.80%  No vitality, no potions  1.60%

As you can see, I gained 3.4-3.5% with the 55% potions (Draft of the Skilled), and it remained the same when used concurrently with the 39% potion (Draught of the Skilled).

The exp gain decreased a little bit when i dinged 60, which was expected. You can see, however, that I gained 2.6% exp as a lv60 sage with both potions still active, and it remained the same after the 39% potion had worn off.

One thing that is interesting to see is the exp gain when both potions wore off. It varied from 0.6% to 1.7%, with no vitality or potions. I wonder what could have caused that...

Note: all the items were 1st time crafts, so I also gained the bonus for making them the 1st time.

Just thought I would share this with you all, so that you don't waste your potions, like I did.... Wonder if I can get them back, if I petition?

Edit: forums didn't like my excel spreadsheet, had to convert to plain text!