For me, it was temperature control and water chemistry (although I am still learning about water!).
One other thing----Gordon Strong's book Brewing Better Beer. Still my "go-to" book on process and techniques---even though I don't agree with everything he writes. Well worth the $18.
Tell us more.
What type of interesting flavors and aromas when following it with Brett?
If kettle soured and using hefe yeast, how does the beer turn out?
I saw Gordon Strong demonstrate decoction using an old kitchen pan with a long handle. Not exact measurements but close enough to get the job done.
And, yes, I thought about that just after I hit "post reply."
Maybe not exactly what you are looking for-----
But a 1 or 2 quart measuring cup would work just as well.
https://www.amazon.com/s?k=1+quart+pyrex+measuring+cup&crid=2ZG9TXIAJMA8N&sprefix=1+quart+pyrex+%2Caps%2C164&ref=nb_sb_ss_i_7_14
This reminded me of a trip to Toronto. My wife and I sought out the Beer Bistro and had some great meals there. I got mussels steamed in beer. Great food. http://www.beerbistro.com
I would be more than glad to pay the extra $9 if I got to the second round.
The past 3 years, I have scored 38, 38, and 40 and didn't advance. I'm hoping this year I'll get to the second round.
Gordon Strong's Brewing Better Beer is my go-to book for process. More of an intermediate book than a beginner book.
Malt, Hops, Yeast are also on my list
Randy Mosher's Radical Brewing and Tasting Beer.
Styrian Goldings
"Sensory: Invitingly earthy and resinous as befits its Fuggle background, but with a more refined and restrained nature. When used in a hopback or as a dry hop, look for heightened floral and sweet spice."