I converted my used GT Aggressor Expert to a 1x8 and love it. However, the rear shifter won't shift up to the next gear in the middle of the cassette on one click. I have to upshift twice and down once. If I adjust he cable tension, it does the same thing - but on the downshift.

New cable, new chain. Rebuilt the shifter with no change. Clean drivetrain.

The last time this happened (on another bike) , the only fix was a new shifter.

I have hydraulic brakes and don't want the shifter gear window getting in the way of the brakes. I don't need /want it - I never look at it anyway.

Soooo ... long story short (too late!!) is the Box Four 8 speed shifter compatible with my Shimano rear mech?