check it out, i feel your pain, my first grow i used all fox farms, they have a 3 part i dont know if you are familir with them, i burned them early on over fed, i didnt want that to happen again so i stayed the whole grow at half strength, for the flowering stage they make ripeners and bulking ferts, ones with really high P and K like 10-50-10, they make 3 and i oinly, beastie blooms, cha ching and i forget the other, i only had cha ching, i used the one for last 2 weeks of feeding, stay with me on this.....in the flowering stage they need massive amounts of phosphorous P, i didnt provide that, and the regular ferts i was using tiger bloom and big bloom at half strength werent nearly enough, well the strain i had was an 8week strain so i cut the nutes at 6weeks flowering, the plant did exactly what your plant did, small tiny skinny buds, almost no trichs, trust me on this, flowering nutes high in P like a ratio i just described is the way to go,...now if you have a deficiency by other means, like fucked up PH or salt biuld up in the root zone thats a different story, i dont know what your feeding them but as they get older they can take full strength nutes, so dont be shy, at 6 weeks you should see big flowers, this is the period where they put on the most mass, they wont get bigger than this....weeks 5-6 is where u see the most flower growth and it tapers off, during these weeks is when they need the most P and K