A leakdown test has absolutely nothing to do with your intake and IC.
Also, you got it the wrong way around. If you add oil and the Compression goes up, then it's usually the rings/bores.
Correct, but we add much oil, 10-15ml so whenever the problem is wasn't revealed that way.
Now compression is ok, after using brand name engine cleaner, 11.8, 11.3, 11.6, 11.5 but knock volts on 2nd cyl are too much. More than 65V, varied from 40V to 72V, at WOT no matter pressure level (1bar, 1.7bar).