There are some excellent flowering nutrients available. Currently I'm using Growology 3 part system and the ease of use is amazing. The step 2 and 3 have very much ended some of the micro issues I've had in the past.I have used the FF line in the past with some success as well.
I'm not sure what is available to you, or what the budget is, but if you were to pick up any type of bloom fertilizer-- something with higher P,K than N, it will help your issue.
If you are on a tight budget, I recommend a trip to wally's place and see if you can find a inexpensive fertilizer with those characteristics.
If you have a few bucks to spend, check out Growology's line. Your investment will last several grows and the peace of mind in the system is excellent. It's so simple.
p.s. Some of the bigger name fertilizer companies are really good at offering supplements for micro issues. This makes me think they short you in the general feed area so you will need to buy additional products. I don't like that thought...