I used to fire up a pair of 235 HP Johnson 2 strokes.----Lots of smoke.-----A am sure people in the marina thought ---" there must be something wrong " with those motors.
The general public thinks that a 2 stroke is an inferior motor.------And those E-tecs operate like a 4 stroke for part of the revolution of the crankshaft.------Able to do that with a good computer.
Your compression values should be around 140 PSI or higher.----I would remove cylinder head to investigate.---Sorry , perhaps you bought a " trouble motor "