Whats the strain? I have grown a few Haze strains that were 70/30 Sativa to Indica and the wait was always worth it but it is like watching grass grow at times. Before you give up and chop it bump the nute mix up, every time I hear a  strain is sensitive I under feed them until I figure what they are sensitive too. If you have any K try a little extra. On the other hand 3 months is a really long time to not see more bud growth.