Changing doses of B-ionic won't impact algae, but IMO it negates the primary advantage of a two part system, which is that you do not need to constantly monitor everything to keep things just fine (assuming that salt mixes used for water changes are not skewing things up or down).
For example, if you start off at appropriate levels of calcium, magnesium, and alkalinity, and dose B-ionic or other two parts to maintain alkalinity, then calcium and magnesium will follow along with little concern or measurement, at least for a substantial period of time.
But if you start using uneven doses, you'll have to measure constantly, and while that sounds best, it really turns out to not be, and folks end up on a roller coaters of elevated and depleted levels of things, they run the risks of kits not giving appropriate answers, etc.
So in general, I really think it is best to stick to equal parts of daily dosing unless calcium actually rises above reasonable levels, or falls below them (say, 380-500 ppm).
