Do you have the Z134 Continental in your 35?
Years ago when I got my first MF50 with the Z134 engine I bought a triple pack of oil filters online and the seals included where terrible. I could not get the canister to seal against the block, it would blow out when I started the tractor. I now only use the Napa 1010 filter and the included seal is much better and I have never had this problem again and I have six or seven Z134 engines now. So, if you have been using cheap filters, try a better one. Either that or there is a flaw or dent in the mating surfaces of your block or canister.