i have heard of manipulating the day/night cycle to 12 off/ 10 on, to hasten the harvest, but the less hrs of daylight you buds recieve the less your buds will grow, so you speed up the finish at the expence of yield.

just a thought....what if you changed the cycle to 12 off/ 14 on? i believe the only internal timer the plant has responds to the night cycle, so theoretically you may be able to get a larger yield by giving the plant more time to grow with out affecting the flowering process.