No excuse for stuck coins. If blocks are being solved for a coin by any pool then they mature.  Pay up.  If you cant do a manual payouts yourself, just stay away from that pool.
 
I mined at clever but the hashrate I get there after days and days is 5-10% lower than at say coinotron or f2pool and f2pool is like 8000+ miles away.
I test pools with some of my miners for a week or 2, compare payouts and go from there.

1.3Mhs x 5= 5.4 at clever but 6.5-7 or more at another pool when the reject/stale rate is included. I lost a tiny bit of profit during the testing.

vardiff locked at 512 may be the cause but I dont have time to wait for someone to fix their pool.  I leave and check back in a few weeks. ROI is all that is important.

Also, dont be a dick because he may take offense and your $1 will never arrive.