Dan, great observations! You've got me thinking again lol. Do more spray rinse increments with long spins in between them have any benefit over fewer spray rinses that are longer in duration with fewer spin time in between each? Does one long spray do the same work as many smaller sprays of equal total duration?
For example-
Start spin ; Spray 30 seconds ; spin 2 min ; spray 30 seconds ; spin 2 min ; spray 30 seconds ; spin 2 min ; spray 30 seconds ; spin to off
VS
Start spin ; spray 120 seconds ; spin to off
I use to think the prior method of letting clothes reach terminal saturation, then spinning them dry, then re-saturating them again (over and over) produced better results than one or two continuous running sprays however I am now question that assumption. I am now postulating that water going through the clothes is what does the bulk of detergent carry away rather than garments absorbing water then releasing it over and over again. This would also suggest that far more water passes through the fabric rather than bouncing off of it once critical water retention is reached during the spin spray.
Hhmmm... That is something to ponder on.
The latter offers a huge advantage in that complex sub interval increments are not needed on incremental advance timer. Of further advantage the total spin time can be shorter - 12 minutes instead of say 24 minutes.
Dan I am thrilled you are also getting the same observations with water proportions. It appears that in the very least with Speed Queen, Whirlpool and Maytag top loaders 1/2 a tub of spray rinse water = 1 tub of deep rinse water. 1 full spray tub = 2 deep rinses.
Good starting point for further experimentation.