i deposited 50 with a 300 % deposit bonus rules were near like your's , i had to play $8000 , 40x 250 $ and i do it
i give another chance to all alboard where i never won anything and i got a boom in free spin , then i was up 1500 but always 3500 waggering to go , i go to a slot i never play , THE BACK NINE , a new islot , and my god i got many times the bonus with 5 icones
so i do my playtrough played by $3,75 bet im happy , that and also won on the new rival you give us
they were longer for this one i was unhappy and say them on live chat , said they got a little issue with withdrawahal 
but all is ok now