Last time I looked i had an estimated 0.30 from my mini-pool members due which we were told would be doubled...
This is correct. There will be a second payout to double your mini-pool payout. This payout will be later added to your account, as our automated script only does payouts according to the regular rules. This is also true for the 1 BTC payout for the non-pool miners, it will be added later too. Do not worry, the money will follow.
EDIT: I've added a small note of this on the minipool stats page