To downsize or not: that is the question

Evening all. Im a 5'9 chap riding an 8ft minimal - the board i pretty much learnt on. I'm very active and surf atleast 4 times a week if not more.
Very comfortable on it, paddling and catching waves up to 3-4ft, doing basic turns and trimming the wave - often trying a pretty sloppy snap or cutback. You could categorise me as an advanced beginner of sorts?
have tried stepping down onto a few boards that are smaller, including a 6'6 shortboard i bought - obviously much thinner and lighter. They go like the wind and are super reactive, but pretty uncontrollable - I don't have much success when I try something smaller for a few days/weeks.
So this is my question; what should I prioritise? Get super comfortable and spend more time on the minimal perfecting manoeuvres, on a board I am familiar with? Or make the plunge down to this 6'6 shortboard, with increased capabilities for speed and manouverablity?
I have been getting mixed reviews from all my peers and don't quite know where to go from here.
Very comfortable on it, paddling and catching waves up to 3-4ft, doing basic turns and trimming the wave - often trying a pretty sloppy snap or cutback. You could categorise me as an advanced beginner of sorts?
have tried stepping down onto a few boards that are smaller, including a 6'6 shortboard i bought - obviously much thinner and lighter. They go like the wind and are super reactive, but pretty uncontrollable - I don't have much success when I try something smaller for a few days/weeks.
So this is my question; what should I prioritise? Get super comfortable and spend more time on the minimal perfecting manoeuvres, on a board I am familiar with? Or make the plunge down to this 6'6 shortboard, with increased capabilities for speed and manouverablity?
I have been getting mixed reviews from all my peers and don't quite know where to go from here.