bmx bars are pretty heavy though, on a bigger bike like this with brakes and heavier tyres and stuff it all adds up. I think it looks better than long stems with forward bars still
On to the bike though, it's super clean looking! Love the colour too. From personal experience a long stem (90mm+) on a steep head angled bike makes them a bit too twitchy for me, Ive jack knifed my bike a few times when trying different stems. If that works for you then all is well though, just if you find carving for spins a bit odd you could just try a slightly shorter stem and see if that helps.
Make a vid BTW