That is why I am a Don Mega **** Bag
What seals did you use?
How was the rotor housing on the front?
As some sort of practical help, if you take it easy and they are factory apex seals it will take about 7000km of daily running to make them flat or conform to housing distortions.
I'd be interested in your compression test to see if this is the problem or not.
FWIW I have "rebuilt engines for a total of $300 for mates many years back, one was a 3am job in his garage replacing a rotor housing with one I use to jack up my car! (filed the rough spots off where the chrome was chipped!) and slapped it back together with new Mazda Apex seals, that motor survived for years at 22psi boost on a T04 and about 480bhp lol, it was how I learned about the power of stock ports. Even on a dodgy rotor housing (by my standards 10 years ago) it still had good compression to not foul a plug, but ran OEm stock 2mm seals.
My world is not much different to anyone else's here, that is why I post up advice (and a bit of a rant some times haha)