I've been in that situation many times, so I can definitely relate. I think you're on the right track by avoiding the high jackpot games, instead playing something with lower variance. But, frankly, game selection isn't going to make a dramatic difference I don't think. Fortunately, the Microgaming slot payouts are better than most land-based casinos, so you still have a decent shot at leaving a winner.
If you'd like to take a shot at one of their progressives, use the list at
http://www.slotcharts.com/jp.php to see which games are at unusually high levels. Unfortunately, as of this morning, only two of their 14 progressives are above the average hit value, and even those, not by much. (That's a little unusual. Typically there are several standouts.)
Back to the non-progressive slots, my experience has been that the bonus slots where you win free spins are too high in variance. Yeah, you'll do fine if you get lucky, but so much of the return is tied up in the free-spin feature (often with a multiplier), that the base game sucks up your money. I also find the basic 3-reel slots are too boring, so I usually end up playing something like Big Kahuna or SkullDuggery. I've had decent success on both.