As a newby myself I can only tell you what has worked to me. I finally broke down and built a frame to hold pieces of freezer paper and shot through the paper to paper tune my arrows. I shoot carbon 500 goldtips out of a Bear Super Grizzly 45# @ 28 and I draw just short of 27" I use 125 tips and have 5gpi weight tubes inside the shafts. The arrows are 30" long.
With that set-up I shoot bullet holes through the paper from about any distance (out 15 yard is about are far as I get right now) if I change anything, arrow length or tip weight I start to see tears to the side as the arrow wobbles. I will be shooting 135gr zwicky's for broadheads this season.
I tried a weight kit and put some real heavy stuff up front and it just killed the paper testing. I starting working (still am) very hard on my form. This has made a dramatic improvement my release was sloppy and I was not "locking on" target with my eyes, it really does make a different. Started shooting a little orange earplug I stuck to may target to give me something to pick out and stare at. At 10 yds I can now group within an inch of the earplug pretty consistently. Still working in the 12-15 yd range.
Good luck man. Don't give up it seems like at some point the body just "gets it" and you start improving fast!