I have the identical setup that you’re using, JCMYERS.
For the KW I used U as the common, and A & B to power two separate L shaped loops.
To power the 14 O22’s I’m using throughout the loops, I’m using the 1033’s C as common, A for 16 fixed volts, and B for 11 fixed volts. I’m also using two MTH 24 port terminal blocks to supply voltage to accessories. One terminal block uses 11v, the other 16v. Accessories like fixed voltage plugged switches, icing station & American Flyer baggage smasher & others love the 16v. Some accessories like the 494 beacon, AF barrel loader & AF sawmill plus others like the 11v.
I have ALL of the commons linked by jumper wires running between the U on the KW, the C on the1033, and both main negative (common) black posts of the two MTH terminal blocks. The KW’s hot A&B do not run through the two terminal blocks, only to their respective tracks. The 1033’s A post is connected to the red (hot) post on my 16v terminal block, and the B post is connected to red (hot) post 11v terminal block.
This has worked flawlessly, and I haven’t found the need to instead use the variable voltage option on the 1033.
Hope this helps!
Tom