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Primer seated a little bit too deep

I am using Federal 100 small pistol primers for 9mm reloading with assort brass picked up from the range. The primer seated by my RL550B on a 9mm case seems a bit too deep and the center of the primer looks concave a little. Is there anything I can do to adjust the primer seating? I am new to Dillon and reloading in general. Thanks.

Primers are seated by feel. They should be seated somewhere between .002" - .007" below flush. It is very difficult to overseat a primer, as the design of the seating punch prevents it from entering the primer pocket too deeply.

there is a adjustment on the primer pin that pushes it up into the primer pocket.   I us a small flat head screw drive and hold that down with pressure until I can tighten the screw down.  try that and see what happens 

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