The formula for equalization is a formula. As an individual experiments they find batteries exhibit truly odd characteristics. So it is for all manner of charging. An amp hour is -not- an amp hour in all cases when it comes to electrochemical reactions. Trends and tendencies must be noted and obeyed exactly like you are doing landyacht. You are squeezing power out of a flooded battery that a plug n play artist would have relegated to the recycle pallet long long ago.
Much of the commentary I write is not directed toward one and two car jar RV battery and pair of GC three cell batteries. Rather, at lurkers who have four, six, ten batteries not just in their rig but in an off-grid vacation home.
Theory in application of what really happens in the interaction between electrolyte and plates is worth about ten cents. Any book can explain the concept. The reality is, an incredible ballet of coincidences dealing with things like deep pocket occlusion, gap bridging, mossing, and other esoteric phenomenon that renders some accumulators "weird acting". I realize what is happening. But that does not change the fact that I am bound hand and foot to managing using exactly the same protocol to deal with the vagaries as you are.
This all sounds intimidating. it isn't. Once you learn what the little monsters demand, you can tailor a charge profile, press a button and walk away. You are a smart charger...