I think you need a nice all around feed. If that bloom formula you are feeding doesn’t have a good source of Nitrogen - I’d find one. You don’t wanna go overboard but I’d feed a nice even feed like 1:1:1 or 1:1:2. You still have some time left on this so a boost of nitrogen won’t be a big deal.
My bet is you switched to a flowering formula too quick. You still need nitrogen at good amounts thru first couple weeks of flower, and still small doses after that.
Good luck