Float height doesn't make sense??

[BlackScreener]

I have a similar problem with EC 300 2001. My settings:
- new S3 cylinder 2013 or 2014
- new 2014 cylinder head
- new Vesrah crank
- all new bearings in the engine
- new pipe from ec 06 or 07 without catalyst
- cdi from 2001
- new ngk br8es plug
- new hiflofiltro air filter from cr 250 00-01
- stock muffler

Carb is PWK AS1:
- N3EG needle, 3 clip from top
- 42 pilot jet
- 178 main
- 7 slide
- new boyesen reeds
I run it without reed spacer.

Before rebuild, engine lacks with bottom end power. I thought it was problem with 250 97 cylinder in my engine but with new 300 cylinder still bottom was weak. I found that it was caused by the exhaust valve. The valve opened too quickly. 1mm shim made the deal, now I have got bottom end power. However, with 178 main engine feels rich and don't rev. With 176 revs seems well but only if engine is well heated. 174 main seems flat at top and it is hard to say that max rev is ok. Only 176 jet works good, but power wheelie at 4th gear is almost impossible with 13-48 gearing.

Piston at BDC is placed with top of the exhaust port. Squish is 1,60-1,70 mm.
16 or 18 mm float height doesn't make any difference in my case. It revs to 9800-9700 rpm with 176 main, but it could only be on stand.

Can too much shims in power valve be the reason of tamed engine?