The Mono Shock skid sucks up allot of top end, I could never get mine to shift all the way out on the clutches with the skid in there.
All the RX-1s came clutched the same, but you probably need to helix down with the Mono skid to shift out.
I swapped to a Warrior skid (ProAction) and went from the Ripsaw to a 1.375 paddle (longer track with longer lugs) which should have at up MPH, but I gained 14mph on the speedo.