I have a fairly built ls/vtec with:
81.50mm pr3 pistons
B18b1 Block bored/honed
Balanced rotating assembily
B16a2 Head
RC 310cc injectors
4-2-1 header with muffler
Cold air intake
Blox type b cams with blox valvetrain
skunk2 cam gears
omni power throttle body
pro engr intake mani,
running on premium 91 octane, and we can advance the car 60 degrees on timing and the car still won't ping. I could use some advice to what is wrong with the car. I also had a loss in horsepower since the last time I visited him, and it was a 25-30whp loss, which now puts me at 147 whp. I also have a wandering idle from time to time. I also have the issue that while driving at a consistent throttle, the car feels like it is cutting out.

Cylinder 4 3 2 1
Compression was 215, 210, 220, 225
Leakdown test 6%, 0%, 2%, 0%

Any of your thoughts of what it could possibly be would be greatly appreciated. Thank you.