2nd spike on Phal Doris and just lost flowers

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I just repotted my phal that I bought from Woolworth, similar to your Wal-Mart.

The repotting has damaged some flowers and some of the flowers have died.

This phal is on the second bloom (there is cut on the spike and this is a regrowth on the original spike) I bought it this way.

I reppotted because it was in spag only. Luckily no rot, as I got it as they were unpacking it from the nursery.

The reason I got this one was that the bloom had 8 big flowers 12cm wide or larger each and I read here that the second bloom is usually smaller and less of it, my reasoning was since this is the second bloom, next year the first bloom should be bigger, if I get the culture right? Am I correct?

Also where should I cut the spike above the last node?I want it to build up for next year.

Ok finally a bizarre question for sure, what would happen if I left the spike but just cut of the flowers?

Sorry for the long winded questions, I am a novice with plants and just spent a fortune on 40 plus orchids lol!!!!