RE: PROBLEM WITH DRENALIN
You've gone from basically a deflex riser bowand subsequent very forgiving bow to a heavily reflexed riser bow and therefore a harder bow to 'control.' Throw into that a straight style grip to a different grip and you've got a recipe for problems in shooting.
There may be one or many things wrong with the rest of your setup; but, without seeing your equipment and you firsthand, any comments are speculation.
My question is always, what is your PRO Shop doing for you. Then the second question is whether or not it's a PRO or archery shop. Also, someone mentioned a possible bent riser. This is hopefully not the case, but I visited a Mathews dealer Saturday and was shocked to find that all they had was one antique bow press. I told them that they had better get an up-to-date press if they're going to continue pressing parallel limbed bows.
Good luck and if you're anywhere near Baltimore, stop by and I'd be glad to check it out for you.