Looking back when I posted this, everything was wrong LOL. I eventually destroyed the engine. Conrod broke and I should've checked it. Tuning issue was due to that. It just takes time to build up knowledge on clutch and engine it seems.
And the bogging I asked about to you guys seems to have been coming from both from engine and clutch shoe slightly touching the bell when it's not running. I didn't know it should not touch the bell at that time.