Heavy TS390 Trigger Pull

I am new to crossbows, but I feel as though the trigger pull on my new TS390 is well above the advertised 3 lbs. I have measured the pull on the shotgun I use for skeet and sporting clays at 4.25 lbs and it requires much less effort than the single stage TriggerTech trigger on this crossbow. Has anyone else had a similar issue? Is there any way to adjust the pull weight? I feel as though this xbow is a winner in many respects, but the heavy pull is a negative. Thanks.
FldTrlr