JohnBuckner and TomCrump have pointed out some of the flaws in your thinking. Let me add a couple more. An excessively nose heavy plane has a couple other negative characteristics:
1. It will tend to climb under power and will require excessive trim adjustments between low and high throttle settings to maintain level flight.
2. An excessively nose heavy plane will take longer distance to land, partially due to higher landing speed, and partially due to the tendency to climb if you add any power. This makes it more difficult to get a smooth flare and touchdown.
There is an old expression that is sometimes taken to extreme: "A nose heavy plane flies poorly, a tail heavy plane flies once". While true, an excessively nose heavy plane can take a lot of the fun out of flying it.

There is also another tried and true formula for balancing if you don't trust the specified CG. This can be a little more difficult with some wing profiles, but with the MKII, the wing is pretty much square. (Close to the same width from wing root to wing tip), so you should be able to check this pretty easily :
Measure the chord of the wing (distance from leading edge to trailing edge) and use 33% as your CG point. In other words, if the wing chord (width) is 12", a good starting point for the CG would be 4" from LE.
This should be nose heavy enough to give stable flight, but not so much to make it so "climb happy".
If I remember correctly, the MKII actually has a chord of about 10.5". If the wing chord is 10.5", then 89mm would be right on the money. So your error, as JohnBuckner pointed out, is probably due to trying to balance with the nose down instead of level.