The fact is, this has not always worked this way. It may be just with LU22, or perhaps further back than that. I only started playing this game again two days ago, and I only noticed this occuring yesterday, so I can't say for sure. The point being, you only have to do SOME damage to the mob (an Ego Burst while it kills your current pet works) then charm it, then let it die, and you get *full* exp. You get no body, but you do get chests and quest updates. I was chaining 65^^^s in Sanctum of the Scaleborn (at 61-62) doing this, low risk, and the exp I got would have been sufficient to do 60-70 in a 48, and maybe 24 hour window, I absolutely guarantee it. I don't want your 70s, but grats on those, I'm sure someone else has a single burning a hole in their pocket
Anyhow, I won't repeat it again, but go test it and prove it to yourself if you do not believe me. Obviously if you're already 70 you'll just have to take my word for it, or make another coercer, if you so desire.