Pellets For A .177, RWS 34

I've been using JSB Exact Diabolo 8.6g pellets in my 34 for at least 6 years. After trying many different pellets of all brands, I settled of these because they shot the best out of this airgun.

Unfortunately, it has been many moons ago and I don't recall what was tried. It doesn't really matter though because I would like to try a heavier pellet in the 34. I'm not giving up on what I'm using now, just want to try a heavier pellet.

Can any .177 , 34 owners let me know what you're shooting in your 34 that's heavier than I'm using now and having good results.
 
Diff rifle but I was testing the jsb 8s (tx 200). And I was surprised when the AA diabolo field heavy were the best for my rifle. 10.3 grains with 4.52 head size. My rifle chrony around 900 with those. So a little heavier than your 8.6 and the RWS 34 stats says it shoots in the 900+ range?(I also tested the 8.44 AA diabolo field 4.51 head size and they were not as good for me). I wont even go into the dozen other brands and weights I tried.