Still have a couple of Spectrums, one with Proforce V2 stiff, the other an Accuflex Evolution. Took the Spevo out once or twice last year but didn't take long to remember why I changed it out - I'm too old to do it justice.
I have a bunch of drivers in the garage (mostly golf_ghirl's failed search for more distance!) so might have a few tryouts with their shafts, waiting for pro shop to reopen (lockdown) and get a shaft puller. Shop was fitted out last year from retail only, now includes a Trackman studio for clubfitting; club repairs and swap outs have to go off-site for now, and the off-site is also closed due to lockdown.
Oh yeah ... it needs to stop snowing as well ... you can only experiment so much on a Trackman, imo.