Definitely a difficulty bug in the mining software preventing full hashrate pool side. I removed the stale shares option under the miner config area and now my dscc %'s sitting at 98.62 / 99.61 / 97.94 (Qubit / Skein / Myr-groestl).

Poolside still averaging around 25-26 Gh.

Seriously frustrated with Sparkpool and stuck payment. Payment failed but am having no luck in having them re-send it. Stuck as "Applied" on the site. Where as on Leafpool if it fails it will go immediately back into my balance so it can be reprocessed. Have sent multiple support requests with screen shots showing the failure, left wallet open as others have done, submitted the request through the site ... to no avail. I'd strongly suggest others to use a different pool than Sparkpool.