Ok, try this first then. Run a game or two that you know challenges your system, and check some usage stats by running HWInfo in the background, then take a screenshot of the results and post it here. That way, we can see what is the bottleneck and try to find a solution.
https://www.hwinfo.com/download.php
EDIT the 'E' FX chips are enrgy efficient and as such not as powerful. I would guess that is why it is compatible and the regular 8370 isn't. I think you could possibly upgrade your chip, but choose carefully, and identify the bottleneck first.