Even if it was the CPU bottlenecking you... You really have no meaningful upgrade path that would give you enough performance to make any difference. That CPU is still pretty much top tier for gaming. Might be a software issue.
My temps are fine cpu doesn't go over 60 even and the cpu usage is only at 76% And the induvidual cores are laying atound the same number (none of them are working at 100% constantly) i put the fan speed at 50% when i play and it keeps my gpu at arpund 75-80c
there is no way your cpu is bottle necking a 290 even if it was at stock speeds. I do bealive your bf frame rate is quite good. You should run 3dmark vantage or passmark gpu test if you are worried and post them. Will give a clearer picture if there is a problem