Welcome to OG! The 835 like chokes in the .670 to .676 range for most loads. I don't shoot TSS, for several reasons, but my 835 will put 300 plus in a 10" circle at 40 with 3 1/2 Hevi 7's with a Pure Gold .670 choke. The 835 has an overbored barrel (10 gauge) so if you over choke them the pattern will scatter causing holes in the pattern or low pellet counts. Many years ago, shooters on this site did extensive research and found the optimum choke is .670 to .676. Most will tell you, that you can use a little more open choke with TSS. You may want to try the choke that came with it (.695) with TSS but that maybe too open. Pure Gold, Indian Creek, SSX and Stardot are a few chokes that have done really well in the 835 and 935's.