The mk 2 are normally pretty good,do you alway's parralax in the same direction?
Take from close distance to far,i think on the mk11 that mean's pushing away from you.
Also have you tryed a shark's fin wheel,they give you the equivalant to about a seven inch wheel.
I had a new version that had rubbish gap's at the top end,re did the lens till it was set to about 12yds.
It opened up the gap's but i also had a 6inch wheel on it.
About as much use at field target , as a life guard at the Olympic swimming pool.