Never made a strawberry, but generally give it several months, age can really only do good, unless it is a weaker wine not suited for aging, but you should be ok.
Using the whole pack is not the problem. The yeast reproduce a whole hell of a lot at the beginning stages of fermentation and generally yeast pkg are good for 1-6 gallons. So pitching a bit more only limits how much the yeast need to reproduce before they reach their optimum population size. I've found in use and through advice that 71b is quite good for bringing out fruit characters in brew, so I don't see why it would be a bad choice for this wine. The flavors will mellow and blend, and some off flavors will age out completely, but it's hard to tell until you've put in the time.