I would love to be able to play DOA. But not possible, so off I go to play BetSoft.
Some of my favourite games are listed below. Sorry, but am not sure of the maximum X factor on these games - don't know how to work it out. Oh well...some of us are born to be Stephen Hawking, some of us are not.
So...
The Angler: Even the base game can give good wins, and if you catch the FS in a really good mood you can end up with a screenful of sticky wilds. The bonus round is usually crap, but just occasionally it can be OK. The payout table states you can win 130,000 credits in a single game.
Alkemor's Tower: Again, reasonable wins in the base game. Some of the bonus rounds are total crap (Earth Elemental Spell, I'm looking at you!), but some of the others are awesome. But it needs to be in a good mood, otherwise get the hell out.
Puppy Love Plus: OK, I'm a sucker for these cute little puppies - just wish they were kittens. The bonus round can give a good payout, but it can also be crap. But the FS can be triggered frequently, so even though on average, it doesn't pay that well, continually triggering the FS can boost your balance.
7th Heaven: Never seen this type of game before, even though it is classified as a Video slot. If you are lucky enough to get two wild reels (Cols 2 + 4) paired with a 7 across all reels, you will be laughing all the way to the bank.
Under the Sea: Good for steadily increasing your balance. However, pray you don't trigger the FS. You don't get anything for the trigger, and they (usually) are total crap.
More Gold Digging: Wow, can this one pay, both in base game (up to x5 multiplier) and the FS (up to x15 multiplier). Also, up to 2,330,000 credits can be won in a single spin. Have never seen this (how I wish!) but I have had great wins on this game.
Tiger's Claw: Reminds me of Siberian Storm, so possibly a clone. It is a 720 ways with up to 96 FS to be won. Again, good for boosting balances. Base game wins are between 10x-20x, but with the FS, as long as the game is in a good mood, it can wander into W/D territory.
Bamboo Rush: A new game, and I have only played it once, but it really looks as if it has potential.
Carnaval Forever: Avoid! Avoid! Avoid! Dreadful game with lousy payouts. ALthough it says "Big wins with the Carnaval queen", all I can say is: In what universe? And the payouts even for top paying symbols are dreadful - 100x if you are lucky. Did I say I hate this game?
Anyway, hope some of this is of use. And good luck.
I can also recommend Spinfiniti Man and Gemmed.
The latter is like a poor man's version of Megaways with 81 pay lines but I found it pretty good when I did the review. Don't overuse the feature buy though as it will mostly obliterate your balance pretty quick.