I was wondering if having a longer or shorter than average string length is good for 4a. Right now I use a slightly longer(about 1 inch) length than I use for 1a. It works well for leg/arm orbits, but it feels weird on an offstring throw.
It’s really your preferences. It’s what you like your string length to be.
I know I should have my own preferences. I just want a good starting point to look for it.
I would use your string an inch shorter than it is right now then.
I just use the string like the way it is, no cutting at all. It feels a little to long, but I am just to lazy to cut it. 
Anyways, it is your preference, but IMO you should just play with it like you do 1A.