Hawk, to answer we need to know your house bank capacity. For "doing the math" that is.
20% of a 400 AH house bank is 80 amps, 10% is 40 amps. So doing the math backwards says if you have a 40 amp charger you will be able to deal with a 200 ah to 400 ah bank.
I, too, asked my battery guy about "breaking them in" and he, too, had no clue.
Since the original post describes what I did, and the fact that it worked, I'd place more credence in the Ample Power Primer than I would in the battery guys.
In order to get the load up, I used the fridge (which turned itself off after the voltage got low enough for it to turn itself off) and all the lights. I took the lenses off the saloon lights. Don't use the fluorescents, they don't have much of a load and I burned the lamp out on the galley fixture (easy to replace at ACE Hardware).
When I returned the next day, the system voltage was only down to 11.5 V. I recharged overnight, then did it all over again the next two days.
While I didn't get down to 10.5 V, those two cycles worked for me. After a full recharge, I then also equalized the house bank after those two discharge cycles. Ample says do the discharge cycles more than twice, and I eventually will do so.
I have three 130 ah 12V standard wet deep cycle batteries for our house bank. My charger is a Freedom 15 combined inverter/charger that is rated at 75A for charging but the battery acceptance limits it to 70 or less amps for even a fully discharged house bank, but that tapered off quite quickly once recharge began.
Your charger seems "perfect" for doing this for your house bank assuming you have more than one tiny house battery.
You also make a very good point that this can be done on older batteries and give them "a new life."