96 mustang gt with original 5 speed manual trans. It does have a after market clutch and a aftermarket shifter. It has original cable and quadrant. The problem is I usually have to use greater force to get into 1st and reverse from a stop. Every now and then reverse will grind. Once I get rolling it takes less force to engage all other gears. I already pulled back on the clutch pedal to see if I can remove some slack on the cable and I think I was able to engage another tooth on the quadrant but it’s still the same. Any advice on what to start checking or where my problem could be?