Nick and Dunbar… thanks for the info. I’m racing to get this done prior to the arrival of house guests, so, I’m not sure that fighting with my builder is the best option.
I’m not sure how cutting the pipe below the slab will change the angle of the flange. The flange that I have now slips into, and is glued to the 4 inch pipe…it will remain perpendicular to the non-vertical pipe. I’m guessing that there are different flange setups that I should look into. In my mind, there should be a flange available with an angle offset…I haven’t found anything like that…just lateral offsets.