Hey John heres a tip so you can continue to upgrade your speed.
Lets say you get to 244 tempo with 8th notes. Its the same speed as if you lower the tempo to 122 and play 16th notes. So you can continue building speed from tempo 122 with 16th notes. And the day that you can play your scales with 16th notes at 244 and the guitar sets on fire, drop back to 122 and play 32th notes. :)