Your not letting it sit in primary fermentation long enough, pitching too hot and fermenting too warm. You really should let it sit in primarary until you have stable hydro readings for three days. I let my stuff sit for atleast 2-3 weeks. Also, try pitching as close to fermentation temps as possible. Lastly, if the ambient temp where you're fermenting is 68-70, you can bet the beer itself is more like 75 degrees when its very active. Search for "swamp cooler" for help in this area.