Welcome back Bill! Interesting to see a familiar name when so many have decided to use different ones this go-around.
Want to toss some food-for-thought your way since I was just testing Claws with a different Secondary. We had looked at FU > Focus > Slash as being the "best" we could get back on Live, and I still believe that when it comes to maximized recharge, that can be up there, but with the changes to PPM and the ability to access another -Res proc with Shockwave, it looks like a T4 Musculature Core with a FU > Focus > Slash > SW (-20%'ers in Slash/SW) is a solid choice, maybe even the optimal choice if there's not other reasons you'd be chasing Recharge with Spiritual.
If your Follow Up's recharge (without Spiritual) is over 3.3/s, and you have Shockwave with a Recharge at 4/s or less, then I'd say shoot for the Musculature route with Shockwave, and put a -20% Res in it (the Annihilation one so you have two different effect sources, Achilles -20 in Slash).
The chasing of +recharge may very well be nothing but a holdover from the old days. I lost all my DPS spreadsheets and just don't have the energy these days to recreate them from scratch. You may very well be absolutely correct on the Musc + fu, focus, slash, sw chain with 2 -res debuff.
It's just... not as pretty. Ya know?
But you can probably answer this: does the recharge buff from spiritual affect the recharge rate of the other incarnate powers?