Sounds like a balance and fine tune is in order.
Plenty here can help with that; Portland? Dunno.
Do you have a carb balancer of some sort or access to one (buying one wouldn't hurt).
Current: 93 R100GS, 03 XR650R
Prior: 73 CB350, 77 R100/7, 83 R100RT, 04 XR650L
I love every motorcycle I've owned and even some that I haven't.