It doesn't matter which brand of strings you buy. They all need a break-in period. The better ones, like Winner's Choice, Vaportrail, Bucknasty and others need as little as 10 shots while other may need 100 shots. During this time they all creep (stretch) till the strands are all doing equal work. This also varies, with the better ones creeping 1/8" till they settle, while overrated strings like Zebras have been known to creep an inch or more over their useable time.
I've only ever tried three aftermarket strings. Winner's Choice, Prostrings, and Bucknasty, priced in that order high to low. IMO Bucknasty was just as good but at nearly half the price of Winner's Choice. In fact, the workmanship of his servings was even better.
There ae literally dozens of good string makers today. I search either here or the classifieds on
www.archerytalk.com would show some of them. Some are small operations so can't afford to advertise, but make a good string at a very affordable price. They just need someone to give them a chance. The one thing you will notice very readily is that any of them make better strings than what came on your bow from the factory. This also applies to the majority of factory strings.