Rule #1: Don't use Nicehash on a PPLNS Pool
How come you even put instructions on your website with a video on a how to use your pool with Nicehash rental contract ?!?!
Proof : http://imgur.com/mUc4Rvq
However, there are always rounds with bad luck and rounds with good luck. If you're rented hash during a round of bad luck you'll for sure not get the return you'd expect as the round takes longer than expected (bad luck), rounds with good luck however will return more than expected - no one is complaining then 
It's not a matter of less than expected results , I was paid ZERO, after 3 hours of mining and after having contributed more than 240,000,000 shares , NONE of them was accounted as PPNLS , I highly doubt it's possible, NO matter what the N value is in your pool.
Oh and considering support - I'm available through PM here, through IRC, through twitter and through contact forms/e-mails... If you can't reach me, the problem is 100% on your side.
I've contacted you over twitter, on your pool's thread on bitcointalk.org ( as a matter of fact, my post is the last one of the thread ) , used your webmail form, sent an email , sent a PM on bitcointalk , and you tell me that it's my problem !?!!?!?!?
Proof : http://imgur.com/KHD9Hri