Root damage should be kept to a minimum if possible, but as long as it's a small percentage of damage all should be fine.

It might be that at some point down the line they (the plants) will want you to resume a 'normal' nutrient regimine, but i'd stick with molasses only till they've recovered from the transplant shock and previous 'issues'.

What specific soil did you transplant into? Might be enough organics in the fresh soil to take you through to the end with minimal addition of flowering nutrients. Might be you need to add more. Time will tell.

Keep in mind that any stress to the plant can and usually will delay final harvest date. So don't go freaking-out that they're taking longer than the advertisements say...

Are you referring to a b vitamin product for root growth? If so...perhaps you should read this:
http://www.puyallup.wsu.edu/~Linda%20Chalker-Scott/Horticultural%20Myths_files/Myths/Vitamin%20B1.pdf
No, I don't recommend root accelerators, and rooting hormone doesn't help to form roots on roots. (in case you were wondering...)

No additional additives till they recover. They'll find the good soil without chemical assistance.

Keep ph steady, don't overwater, let 'em heal...and be patient.