Can anyone tell me why only 2 of the payouts from Ozcoin are 'verified' and the BTC are actually in my wallet, yet 6 of the transactions (one up to a month old) are unconfirmed, and as such I don't have access to them?

Just looked at those transactions to your address on blockchain.info
https://blockchain.info/address/181MstHu1kBECe1yRUsM4Xp6qU12xiw2yTThey all have many confirmations. I would suspect that your wallet is not connecting or downloading the blockchain properly. You might also try running it with the rescan command to see if it finds them.
It is definitely something on your end with your wallet though.