Congratulations on your first colour prints. It's always pleasing when it comes out right at nearly the first attempt - perhaps not as difficult you might have been led to believe.

My only experience is with the Tetenal RA4 kit and a Nova tank, but I have noticed that the paper starts to look mucky when the blix goes off, so that might be a problem. I recommend a stop bath between dev and blix. Your exposure times sound about right. As for developing times, follow what the instructions say, although with the Tetenal kit you can go longer than the recommended times without ill effects.