Gump,
What's the oal you are using on the 135's?
We just tested some Stock III's , the same batch you got... No problems whatever bullets we feed...147, 135, 124, 115..
in my opinion, if you dont intend to shoot nationals.. then by all means go with minor. but if you are, go with major....the reason being is that national level matches have a well balanced array. if its just a level 1 or level 2 i always see the advantage of using a minor 10 round.
i have friends with over 50k rounds with stock slide stop....if you really need to bring spare parts it will be fiber optic, trigger return spring, sear spring...
i have felt a stock 2 that has one of those cz disconnector. if i am comparing it with an xtreme trigger and a stock disconnector .. the reset is almost the same..take a pick...