OEM sprocket back on the DR650

Was revving too high on the interstate and am using it for a commuter bike at the moment so I slapped the original front sprocket back on the DR650. It is once again a bit sluggish, rolls a bit fast at idle in 1st gear, and revs a bit low at 55mph. But it is a bit happier on the interstate at 65-70mph. Obviously this means I will need more than one bike, but alas, that will have to wait i think. :-(