Is it bad if I need to keep my trim at either around 49 left or 80 right?

I'm using a savov servo and can't find a good center so I need to use a ton of trim.. Moving it one spline over gets the above results.

I'm using the F servo horn that came already installed on the associated servo out of the box. Savox says to use the servo horns that fit Futaba's.

It takes a lot of force to get the horn off and on and I'm always worried about ruining the servo when trying to adjust it.

Should I get a new servo horn or mess with the turnbuckles or something?

One more question, when finding the FDR, after dividing the gears, what number do I use to multiply? In case I worded that bad for my touring car it's something like: 48/82x2.05