Flypool has a message: "Because of performance issues with the Zcash client we are unable to send payout transactions to z addresses! Therefore DO NOT use z addresses to mine on the pool". How are those mining on this pool dealing with the issue. please?
Just mine to a t-address, works brilliantly. I don't know if any pool supports mining to z-addresses, as such transactions are pretty resource demanding. The Sapling upgrade, scheduled for later this year (hopefully) may change that.