My strongarms trigger feels too tight in single fire

i bought my strongarm a few days ago and i must say it is a great gun. it even works flawlessly with the ranges to be expected. the slam firing works seemlessly and im happy about it. but when i try single fire the trigger is very tight so its almost impossible to shoot with 1 finger. you have to press back reallly hard for the gun to shoot. but if i havent pulled back the slide before pulling the trigger, then the trigger isnt that tight at all. the problem is only when i have pulled back the slide until it clicks and then i try to shoot . but it does shoot the problems is i need a lot of force to shoot it, which i dont find normal.

thank you