Exactly my sentiments also. The Maxi Grip is nice but the equivalent Diana raised rail is far superior.
My .22 SuperStar groups under an 1" at 25 yards but is very twangy; indicative of poorly fitting steel guide and inaccurate internal sizing without the benefit of a good quality piston sleeve. The SuperStar just gives a tad more satisfaction unlike something the HW77 can provide. Don't get me wrong my 1985 Ken Turner tuned HW77 will outshoot me day and night.