Higher rejects are just cost of doing coin-switch business. The pool is having overall 8.5% rejected shares today (varying between 4% and 17% depending on hour), which is up from 6.30% two days ago, but it's also earning 0.0156 BTC/day per MH/s today (stats for 15 hours since midnight UTC) while Middlecoin is performing at 0.0069 BTC/day in the same period today with 5-6% rejects. Every pool has its own coin-switch algorithm and is doing things differently, which is why you can experience different rejected ratio on different pools using the same hardware and the same settings.

I will be deploying EU server soon and doing some other tweaks that might reduce rejected ratio for some users, but generally, I am very happy with the results and I'll trade +2% rejected for much higher profits without a blink.

Great to see overall hashrate growing. We always could use some more. If you're happy with the pool, please tell your friends about it. Thanks!