Your dealer is a lazy boob!
those heads should have NO trouble grouping with field points!
Just " looking" at the bow tells you nothing!
He should FIRST watch you shoot to see if there is something your doing wrong to cause poor arrow flight (even so, if you do it consistantly, you can group field points well).
IF your shooting form is good, you should try moving the arrow rest up and to the right SMALL adjustments!!!!
When you get the BH to match your FPs...see how well you group. I SUSPECT that your grouping will be JUST as good.
Moving the sights to compensate a LITTLE is OK...but if your off by 9" both left and down...something just ain' t right there. moving the sights to fix it is just putting a band-aid on it. A couple inches...OK...but not 3/4 of a FOOT!
make a note of your settings, so you can go back to what you have if you go too far...or see a decrease in accuracy. then start adjusting it yourself.
Good Luck!!!