Basically, all balances should be mature now, since your last block found was long time ago. Maturing block takes 100 more blocks only. I guess those are just marked as immature, but are OK to be sent.

There are several problems with the z-nomp software which needs to be addressed for proper operation.
First of all, you need to fix unshielding limit, it is hardcoded in z-nomp to 100 VOT, but block reward is 125, so that stupid limit doubles the time needed to unshield coins. Setting the limit to 1000 works just fine.
Next thing is that minConf is set to 10 in config, which seems too high to me, so each shielding then waits 10 blocks before unshielding, and each unshielding then wait another 10 blocks before money can be paid. So you may consider lowering minConf to 3.
Finally, z-nomp is sometimes experiencing problems while waiting for z-transaction to complete (while it already completed long time ago). So this needs to be addressed too. You may need to restart z-nomp from time to time or fix it permanently by modifying sources to disable waiting for finished tx (not recommended in your particular case)

I am not sure if the z-nomp software continues properly sending out the payments even if the pool has no miners. But it should since the payouts are scheduled by time.