They're your cards, so at the end of the day it's your decision of course. However, unless you also have the original bubbles to stick back onto the cards to make bona fide reseals, I think most collectors would prefer that you didn't stick new bubbles or newly printed parts to cover up picture rips etc. onto original cardbacks. Personally, without the original bubbles, I wouldn't bother trying to reseal the figures, but instead suggest displaying the figures standing in front of their cards. By resealing a non-original bubble or adding non-original printed areas, you're not increasing the value of the cards, but rather simply damaging them, which would be a shame if the cards are as nice as you say.
Anyway, it's your choice of course, but since you asked for advice, that's mine.