Nice one, Sue, I love monarchs in all stages!
Maybe try a polarising filter, I think I had reasonable improvements when I used one on my very reflective and very black ants recently, reducing quite a bit of glare. (Also means less light for focussing

, but this thingy is not running away in a hurry.)
I must apologise for my recent absence from the forum; I got a bit busy, and am also preparing for a trip to Europe. Hope to be more visible from mid-November.