I forgot to add, these have been in the ground for about one week and a half!!

At this time of year, I'd leave them be. Warm season grasses are difficult enough to establish/survive a late fall planting so any further disruption will put them at even greater risk.

It's been my experience that most ornamental grasses are pretty tolerant of being rootbound and although it may delay their growth and spread somewhat not to loosen the root mass on planting, they generally overcome this "handicap" nicely. Just keep them well mulched this winter.

Thanks so much for your prompt reply. I feel so much better.
We'll do on the mulch!!

thanks again

If you are really worried you could replant them in the spring, but I agree that you should not have trimmed the roots this late in the year... so don't fret, you couldn't have done more.