Has anyone had to file there rear flip ups to get them just right at the longer ranges?My standing is fine at 50yrds ...but way high with the first flip up,like 300yrd zero high....

I think you need to send it back to the factory. Call them up and tell them your problem.

Depending on your eyesight, yes most would need to file a sight in..

You have to zero any sight, scope, peep or irons to your eyes and hold..

There is no such animal as one sight setting fits all people.

It is certainly an easy process if you preceed very carefully and don't cut to deep. Keep the sides and top level with each other and allow yourself a rather course bead is my advise.