Cosmo,
I did not use Baqua but used Soft Soak from SpaGuard which is similar and I got the same thing, the gooy peanutbuttery substance. It was because my ph was too high and alkalinity was too low. I was for awhile any way, constantly testing my tub until I got my ph down and my Alkalinity in check. It was a challenge, but after that it was pretty simple. Our city water is way high in the ph area, 8.4 so we used alot of spa down to get the ph in check. Which means the alkalinity was always out of wack as well.
I think if you spend the time to get those two things incheck the goo will go away.
Good luck.
edit: ozone. We kept our ozone on all the time.