That worn center seems to be "the nature of the beast" with the Kenda. Mine looked (nearly) like that when it still had mold nubs near the center! What's a new Kenda have, there in the center; less than an eighth-inch above the wear bars? I thought "over inflation", so I went down to ~22 psi with no noticeable change for several thousand miles. Dang thing always seemed to be wearing in the center, throughout it's life. Didn't look much different at 14000 miles than when I started. I just changed to a Kumho, a couple of months ago, and I'm loving it. At least the Kumho started out with some tread, all the way across. This new General looks like an equally good choice.
Pam: Did you get any resistance from any tire salesman, or bike dealer, when you wanted to make the change? My original on-line order with Discount Tire got cancelled because I spec'd the Spyder for the application. Ironically, the one I put on was from Discount Tire on E-bay, and I got it with free shipping.l
Good ryding on your new General.

DW