Eric in my experience shooting bows for 50 years,, on a low braced bow there is some slap on the arm guard, not throwing the shot off at all,,
if the bow is throwing the shot off a foot,, I dont have any experience like that,,and would not know what to recommend,,
when I am wearing hunting jacket,, the arm guard is keeping the string from catching on the heavy jacket,,
even the best shots in the world wear an arm guard,,Byron Ferguson for example,,
I do rotate my hand to a 45 degree angle on the bow handle, and that moves my arm away from the string a bit,,
I dont think the string is hitting the arm guard harder,, but that is just my experience, and yours and others may vary,,,
but there is a good reason an arm guard has and is an important part of gear for shooting a bow,, its serves a purpose and on a well set up bow, does not impead accuracy or performance,,