Don't do it. Pick a font and stick with it. Too much change interferes with readability and just looks like a typesetter's sample case. If you are brave enough, send a couple of back issues along with a scorecard to a dozen or so of your best counselors and ask for a review. I have found it to be true that good writers are always backed up by good editors.
Nothing interferes with clear communication like poor grammar.
Misspelled words, plural subjects and singular verbs, participles that dangle, disagreement in form or number, etc. Joe has written for hundreds of publications, worked as an editor for a newspapers and magazines and has been a judge and a lecturer in numerous competitions and workshops for editorial personnel. .