Stopped the car in a rest area and fiddle the setting to 0.6 bar and the ER34 will go till circa 180km/h before power was cut. I doubt it's misfiring as there's no 'firecracker' popping sound from the exhaust.
Tried running the car with the EVC off and it's just fine as per before.....well with the exception that the car suddenly feels very sluggish. Oh darn, I think I got too used to how the car behaves at higher boost. :P
Shall I really go for a Apexi S-AFC to settle this problem or live with it until I can really afford an Apexi Power FC? :P
But I guess, in the meantime, I'll just run three boost settings on the ER34. With the EVC off on 0.5 bar; and 0.6 bar and 0.7 bar on setting A & B on the EVC. Interestingly, at stock boost setting, the turbine did not produce a rattling sound as with when the boost was wound up. Hmmmmm………
Oh darn........need to strike lottery man.