New engine build/ Tuning question

[Klutch]

We put together an engine and reused pistons and checked the bore and honed it out and used new rings. Running stock injectors, gen 3 pump, and DP tune for stock injectors with stock hpop. There seems to be excessive blowby and hard starting. We have done cylinder contribution tests and all other tests with scanner and everything checks out. We are getting a IDM code and a computer code, but I assume that is because of the idm being modified and the computer having the chip on it? The question is do the rings take a bit of time to seat? There is about 150km on the engine with just easy driving. Thanks in advance.