Compression should NEVER EVER be low on a "rebuild" if it is then you have been ripped off with sub standard parts pure and simple.
Lots of people use dodgy rotor housings (grooves in them) or Apex seals that are as bent as Carson, it is totally unacceptable to have to "wait" for these parts to conform to grooves in a housing of for the soft as **** apex seals to wear flat lol.
Garbage in = garbage out
TEST YOUR MOTOR!!!
If the compression is low go see the low life who "rebuilt it" and ask WTF? this is what you should be doing first to eliminate the worst case scenario if you do not trust the job that was done.
All other checks like spark and fuel etc come after establishing that the motor is O.K. in the first place.
My 0.2 cents.
