I'm a relatively lean doser, inclined more toward the PPS camp than EI. You may want to study the PPS method to see how it blends with your approach (I'm not a root tab supporter)
Concerning the sudden algae surges, I would tend more to think that it is due to a destabilization issue rather than algae suddenly finding food to eat. Algae is triggered by ammonia(ium) and it takes very little to do it. Perhaps your sudden change in dosing is causing plants to reel back a little, leaving more ammonia on the table. I doubt that our test kits can read such a spike, but you may want to try to see if TAN jumps. If you're inclined to testing, you could also allow about two weeks to see if algae reverses at high dosing levels, after plants adapt.
However, again, I see no reason to do EI if you can do without.