Finally bought a timing light and solved the ignition advance problem. Now I have stable ignition timing which when locked at a given value (say 12 degs) holds that value and doesn't add timing like it did before. Problem now is that the car feels a lot slower than before. I have the feeling that the car now on full throttle is slower than before on 1/2 throttle. I'm basing this on the fact that car run with a lot more ignition advance before ( because it was adding timing ). I had to add 7 degs to the whole timing map just to get it to run ok . Anyway I'm happy that I solved that problem now when I have time I'll port the exhaust turbine housing (bypass port) to see if it'll solve my boost creep problem, if not I'll convert to an external wastegate which is a bit more work. Hope to solve it sometime these days so I can attend the open drag day which is this coming Sunday

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190E 3.0-24v (M104 980) turbo @ 0.8 bar
1/4 mile: 2.483 / 13.540 / 175.17 km/h (street tires)