Well - the two things are really not related -
Here are two examples :
a long span narrow chord wing - which -if flying at a fairly high angle of attack -in level flight - will need differential -or the DOWN aileron will /may drag heavily and just make that wing drag enough to cause a yaw - in the opposite direction of the turn..but....
A very short span large chord - extremely low wing loading setup -flying at a very low angle of attack- may not need any .
your plane is -- somewhere in between these extremes.
so - maybe your setup needs a little -or a lot -
You can calculate your a-- off read formulas till the cows come home - some of which is good readin but this is a cut 'n try on a model
.None of my aerobatic planes have any differential -low wing - raised wing etc - makes NO difference.