Im sure the trigger only adjusts for length of pull, so I'm not at all sure how yours isn't. 2nd stage pull weight is essentially factory set although feel differs between different examples.
Trigger feel is all relative so if say, you are used to T06 Diana then the 45 trigger first stage may feel stiff.
The red screw acts on sear engagement and its possible to effectively bypass the safety if you mess with it. Or use the safety as a trigger!