Because CHNCoin has such a fast block releasing time, your miner will get out of sync with the network pretty fast. This creates loads of stales/invalids. You can prevent this by adding the following flags to your miner:
-s 5 --expiry 5 --queue 0
--scan-time|-s <arg> Upper bound on time spent scanning current work, in seconds (default: 60)
--expiry|-E <arg> Upper bound on how many seconds after getting work we consider a share from it stale (default: 120)
--queue|-Q <arg> Minimum number of work items to have queued (0 - 10) (default: 1)
This pool is been up and running for 36 hours at least now, with steady payouts every time a block has been found:
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