Pretty much any ATF type F or B&M trick shift... I've heard of a mix like GMR suggested but I've not tried it. Evolution Industries recently stated the Redline MTL works well, Ive not tried their primary fluid but their engine oil and tranny oil are one of my favorites. You are not alone in the comp issues. Now that you have a solid set of flywheels, maybe give the EI sprocket a try. If that scares you perhaps the Baker unit. Just dont ride it like a Gold Wing and lug through town at 30 MPH in 5th gear and roll on when you leave town with the EI sprocket. The bigger motors like to spin. To address that you can run the EI sprocket or their 49 tooth basket. Either will do the job or spring for the DD7. The 1st and 2nd gear on the DD7 is righteous! The new neutral detent is killer as well. Finding neutral while heat soaked butter smooth. No rocking the bike at all, just a simple flip of the shifter. Lots of ways to skin the cat nowadays.