Looking at other people's benchmarks that actually seems like a good score for your hardware Can you post a screenshot of you heaven score at 1080p? I would use a newer test like superposition or timespy to benchmark tho. Oh btw you can reenable the onboard GPU again.
Yeh that is a great score, If you want to compare benchmarks more thoroughly i'd suggest installing the 3d mark demo off steam. I use it all the time to see if my GPU is performing as well as other peoples.