Thought I should post a follow up, either for the sake of anybody reading this with the same problem or for the curiosity of anybody who helped me out here.
So I did what seemed to be the popular opinion - I went out and got some Testors high gloss varnish and some Testors dullcote varnish.
Sprayed on a good coat of the high gloss, and finished off with the dullcote to take the shine out of it.
Well it helped, it wasn't a magic undo button, but it certainly helped.
In addition to the varnish, I also touched up some areas with regular acrylic paint, this is far less than ideal and did destroy some of the detail on the model, especially the little black lines in the creases of the armor.
This also ruined the highlighting on the figure, so now it doesn't have very much highlighting. I tried to put some of that back on, but quickly realized I was making it worse.
But - it all helped and it turned out ok.
One of them was unrecoverable, I may consider stripping it and starting again.
Here's a shot of the other one, it's not the greatest but it's passable.
Thanks everybody very much for all your help - saved a pretty nice model for me