I run a couple of bikes with Sugino 75 cranksets (165) and use Sugino BB measuring 68X109. I owned a Surly SR too and recall utilizing this combination without remark. If the frameset can be ruled out, it sounds to me as if the problem may be with the BB. I can't imagine pista cranks (165) creating such issues; especially when Surlly SR with 175 road cranks are not uncommon.