I, & many others on here, have the same model. 4/8 SS bays & 1 or 2 IBAs. Clearly the friction IBAs wash better, but a Touchless IBA can make u a lil more bullet proof, from the "tunnel takeover"...
1st wash i bought 5/1, i switched to 4/2 after a year of steady growth. Lines were too long, so wanted a preemptive strike, against someone w/ deep pockets wanting to take my business. Now have a touchless & friction.
2 mos ago bought a nice 4/1 which has a touchless. Im replacing that w/ a
Razor Edge, for faster throughput.
1st wash I bought, they reported 95% of all cash. 2nd wash, seems like Definitely less than 90%.
Washes ain't all doom & gloom, but they ain't just "keep
soap & wax, & puck up the cash" like a guy told me on my first purchase, 8 yrs ago! He took me to the cleaners!!!