Have you tried RWS Superdomes. They are bit heavier than you want (14.5gr if I remember correctly), but close on size I think. Their quality always looks good. A lighter pellet is the Milbro Caledonian, but they never look too nice. They are cheap though, but if you use them put the gun over a chrono.
I've tried a few different pellets in my 127, Accupells didn't work too well, AA Diabolo Field worked very well, but cost, H&N FTT were ok.
So for me, cost and consistency (compromise), I stick with The RWS SD's. On my gun they run at about 11.4.
"If I turn out to be particularly clear, you've probably misunderstood what I said" - Alan Greenspan.