Science certainly does equal disprovability. The problem is that every time the Neo-Darwinists are presented with compelling evidence or arguments that question their orthodoxy, they resort to fighting retreats, evasions, and outright straw-man attacks.

Furthermore, let's say that the mutations are, indeed, semi-exponential. Neo-Darwinists should still be able to come up with some sort of non-linear model that gives very approximate rates of mutational change. Such a model will certainly not be perfect, but it should be able to "fit" against past historical time-series data – because that semi-exponential series would then account for the huge gaps in the fossil record that the neo-Darwinists themselves keep lamenting.

Since there is currently no "better" explanation, or a theory, it means that until such a theory comes along and provides better prediction, "Science" is "stuck" with Neo-Darwinism.

I wouldn't go anywhere near as far as arguing that there are no "better" explanations. I argue instead that this is merely the "widely accepted consensus" – and I have about as much respect for the notion that "consensus is scientific", as I do for a fat otaku farting in an anime convention.

If you look hard enough, you'll find compelling alternatives to neo-Darwinism. They have their flaws and problems, and appealing to "intelligent design" or "Creationism" may well be a bridge too far for those of a more secular bent – but appeals to an external Creator do not constitute the only available alternative theories.

As I recall, you have "steps" or "jumps". Meaning that you accumulate a mass of mutations and then become a new specie.
This means that your mutations are not average, but semi exponential.

For example, you may have 100,000 years with limited mutations (homo sapiens) but before that you had 50,000 years of increased mutation.
Kind of like the inflating universe theory.

However
Since there is currently no "better" explanation, or a theory, it means that until such a theory comes along and provides better prediction, "Science" is "stuck" with Neo-Darwinism.

Science = disprovability