Maybe try pawn it off on ebay and put the money toward a better rig. Maybe that 1023 as well.
Something to think about here - Gast 2567 with 2HP, dialed back to 1023 (10 CFM, while maintaining max pressure) will only eat about 300 watts.
RV's follow the Affinity Law's quite well, except they are a more Positive Displacement pump so they don't loose output pressure very quick, but will if you drop them too low.
I'll be calling a few more MFG's that make the pumps with the flat line across the chart rather than the curve or some sort of angle.
RC - I don't really know why Gast changed the motors on the 0523, but after messing with the numbers a bit, it appears that the engineers on the 1/3HP version were following motor load rules and bumped it up a bit for efficiency, rather than running it balls to the wall.
