I don't think playing different slot games actually matters, you probably just got lucky. Casino betting can be very funny, sometimes you'd just get lucky consistently with any trails you make and it doesn't even matter what games you play you'll be making profit. It's all about luck and timing, it's not about playing different slot games. It would turned out that after playing those different slot games you'd lose all, it's just a lucky outcome and not really the pattern you use in playing. Don't get overconfident with this. It's all about luck.
No, it doesn't, Slot games have no better means of winning, switching it adds to the fun, but may not generate wins. Making fresh changes on games for winning purposes only raise the player's curiosity to try new strategies that works. Hence, if not done right, the strategy could be harmful to gamers who don't care about limitations.