There is no way on earth you would hit 17 blocks in 2 weeks with that hashrate, slushpool does "use" your hash power to mine other SHA algo based coins that have very low difficulty whereby finding 17 blocks is fairly easy, the rewards of those 17 blocks is probably equivalent to the amount of BTC rewards you would get mining BTC only.

You can confirm this by looking at the best share your miner scored, if it's => than the current difficulty of bitcoin then you found a bitcoin block.

Now assuming your miners ignores all the probabilities and math in the world and does actually find 17 blocks, mining on a pool does not give you any advantage over miners who find no blocks, this is the exact reason why you do get paid even if your miner doesn't find a block.