Miami Half- Super Shoe Help!

I am running in the Miami half marathon at the end of the month!

My question is about shoes!

I have been training with the saucony endorphin speed 3s, but I plan on running with the Alphaflys on race day.

So far, I have only run 1× 3 miles, and 1×8 mile test runs with the alphaflys and I am loving them!

My question is, should I continue to run my remaining 1.5 weeks of miles/taper in the alphaflys? (I have one more 12 mile long run this week before I start my taper- hal higdon) Or, should I use my Sauconys and save the Alphas for race day? Or, should I rotate both shoes every other run until race day?

I have heard that people save certain shoes for race days, but I wasn’t sure if you need to be peppering in some days with the race shoes throughout training.

Help!

Thanks so much!!

-T