I own 188 FRS in enduro/stock flex (4) and layup, and 187 Protest in MAP/carbon. Don't know the Protest flex but guessing a 3.
I don't love the FRS - it's a great freeride/comp/pow ski, but I didn't love it in resort chop after the first couple laps. I much preferred the Rustler 11s I skied the same day. But, take that with a grain of salt, as I did not like my 187 MVPs either, so maybe I just don't get along with that shape too well. Dunno. Both were flex 4. Longer thoughts from several on the FRS:
https://www.tetongravity.com/forums/...duro?p=6274550
On the other hand, my Protests are cold dead hands skis. I LOVE touring in them. I just got some 196 enduro/flex 4 off gear swap for a resort pair to complement the 187s for touring. I've already skied about the scariest stuff of my non-scary-skiing-life on the 187s when they had alpine binders (Chimney Sweep and Middle Finger at Squaw if you're familiar), so they handle the technical stuff damn well. Need I mention how they ski pow, mank, crust, hot mush, evening funk, even refreeze?? They ski that shit awesome.