Freak

Yea, that is why I want to open up the engine again.I also suspect something is not 100% right.
Strangely enough, I took it a couple of weeks ago in second gear slowly up the rev range.It is smooth all the way up to 5000rpm and then it starts to gradually vibrate more and more.
My flywheel was skimmed two times in the past due to first being a clutch replacement and second time due to bad clutch replacement first time and also bad skim on flywheel with first clutch replacement. I wonder if it is not the flywheel that is out of balance due to all the skimming?

I plan on putting in a mild cam that will give good torque and good power all through the rev range.

About the A12 beating a A14?
Sorry, been there and done that.
I did it three times in a row with a new Nissan 1400 bakkie as we currently still get them in South Africa. Hooking 3rd gear, bye bye bakkie by about one car length.That time I pulled only 6000rpm and it was the first time I noticed the vibrations.
Ok, I must admit. The bakkies are build here for carrying large weight (500kg) and fuel economy and not for speed.