Do you monitor oil temps?
I would stop using M1 filters. which PN M1 filter? what thread for the dual mount?
Is that the temp with the aftermarket oil cooler? or did you remove it already?
220F in Florida heat is not warm enough to worry about. Was worried about overcooling but not an issue. I don't think you're oil is getting too hot to justify an overly thick oil. I would slowly step up the HTHS and see if anything improves. Try the multivehicle 5w30 T6 rotella or the Delvac Extreme 10w30 before going to 40 grades.
Did I miss the post on your air filtration type/brand/mods?
I would mix oil filters. Use an XG8A with a Baldwin HPG, Amsoil, XP/Platinum, RoyalPurple, Boss ... synth media filter.
Another option is the 1-16 converter for a bigger filter. For example:
KN filter or KN style? style means? Maybe toss in a Fram Toughgard or Wix heavyduty filter for a couple UOAs. Or, AFE 5-layer or dry filter or AEM dryflow?
Limitations on each oil filter adds advantage when paired with competing filter. Since performance of any ol filter is truly unknown, pair 'em up. All media types have performance limitations.