Fellow blaster here and felt i'll chime in.
First off, Work on paradiddles, double strokes, singles, and everything else. It REALLY helps your control which is critical at fast speeds. My band tends to write 220-240 BPM on average and blasting at those speeds took a while to build to. Especially in the long stretches.
They key to single strokes is to be able to do them for a long period of time and do them RELAXED. If you tense up, it's game over.
Make sure you use a metronome for practice. Set it to a tempo you can play for 5 minutes straight without a break while staying relaxed. It might feel super slow It might be 140 BPM, but I'll often do 10 minutes at one speed to start, focus on keeping the stick heights low and not tensing up. keep the hits as even as you can.
go up 10 BPM. How long can you do it now? if you can still do it for 5 minutes, go up another 10. Doing this every day or every second day for a few months will bring up your bpm forsure.
I did this myself a while ago and what it did was cause me to get used to the speeds for extended periods and relax. 210 is a very comfortable speed for me. once you get above 210-230 it gets even more important to do this as you need to be engaging the fingers and wrists now. I find focusing on stick heights has a been a great way to stay relaxed. also try not accenting the right hand every measure for time.
I feel 210 is not that far out of reach, but when you say 190 you need context. if it's not tight and not for a while don't let it get sloppy.. It all comes down to just time and sitting on the pad playing singles.
another big thing that helped me was drumset ergonomics. if you are reaching it makes it much harder. my elbows are at my sides when I blast. Make sure you are hitting straight down on the drumset too and not on angles as gravity helps too.
Gripping the sticks too hard will slow you down as well.
Posting a video always helps if you want any advice, but grind it out and good luck.