Shim blade on top of the cutting blade - on the cap side? Thanks! I hadn't thought of that.How about I help you stick to rule #1 and change your mind again?
Have you tried reverse shimming the Athena? It’s a rigid enough design and that might reduce blade exposure just enough. The nice thing about reverse is you don’t have to futz with it every time you change the blade because it’s on the bottom(or top once assembled). You will need to be careful careful how you cut the shim, for it to be effective, due to the tiny blade reveal on the Athena.
It would certainly be an interesting experiment, so why not? I need to plan out the best time to phase this A/B experiment in. I'll report back when I do it.
One other thing I wanted to try with the Athena (and didn't mention above) is a slightly duller blade like the Gillette Wilkies which you (or was it @spacemonkey42) mentioned.
Running through this testing cycle was complicated enough with the 2 blade comparo.
It's time to better optimize/match blade to razor.
... Thom