"I tuned the carbs to run a little leaner since I'm at 5300 feet in elevation here in New Mexico, and I bought a 44 tooth rear sprocket to replace the stock 39 tooth. That should really give better torque in all gears, but right now top end is 70 miles an hour, which is fine, but the RPMs seem a little high."
Try a 40-42 tooth. Any good machine shop can cad/cut one for 100.-150.00 I've had quite a few cut in the past.
"The Harley dealer here in Albuquerque has free hot dogs and chips every Saturday, so I rode on over and parked with all the Hogs to see if anyone noticed anything unusual, but either they're all bored with motorcycles or didn't look close enough to suspect it was a 250."
They were all pointing and laughing behind your back...~