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booster should not change engagement point, just effort. if engagement point is changing, either (a) your fluid is compressing (air in system) (b) the caliper piston has to travel further (thin pads) or (c) your fluid is going somewhere (leak in the caliper at the bleed valve or piston, bad MC, bad ABS pump).
given system is bled, pads are newer, MC is new (unless you got unlucky w a bad new part) and no obvious signs of leakage, suggest ABS pump may be culprit? realise it could be failing without producing a code (i think abs codes and piwis tests are more for proper actuation of valves, and not for leaks). i'm no brake expert, however.
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