First thing's first,it IS a very annoying factor of growing..having to wait FOREVER for some real nice budding to begin...however,you must remember that those pistils DO come from bud sites...each pistil coems from a single small flower site,and during the flowering process,the buds "stack up",ending in nice big flower clusters that VERY grower wants....So if there are pistils,or "hairs",then there are bud sites...just not enough for you to be able to see the "big buds"that result from weeks of flowering...Also,what light are you using?Id recommened a 400W HPS or stronger for flowering....the red light spectrum mimics the natural orange tinge of the "harvest sun"....or the later months of the year.
Also,you might wanna leave the plants in TOTAL DARKNESS for up to 24 hours before making the light switch..this will "reset"their internal clocks,ad can shed 1-2 weeks of flowering...it basically forces the plat to show sex and begin flowering than just making the normal 12/12 switch.Also,what nutes are you using?Look into mollases...and stop feeding high nitrogen now,and higher pottash and phosphorous..