I guess its one of those things thats just got no absoloute control, Factors of how much hop matter you get in the cube, how quickly it cools down and probably 1000000000 other things...
i guess its trial and error on hop additions to make beer and unless your trying to Exact clone a beer either commercial or just a previous batch, im guessing no chilling wouldnt be ideal for that.
my kids use the bath on the daily, was thinking about configuring a imersion chiller to fill the bath up then i wouldnt be so worried about using all the water, thus being the only reason i'm not chilling.
brewing uses tonnes of water so i'm trying anything to bring that down.......