Is "more optimal" correct grammar? [duplicate]

English grammar, in its truest sense, is not a set of rules. It's what proficient speakers say. If a community of proficient speakers have started saying more optimal then, within that speech community, more optimal is correct. Presumably, they consider optimal to be gradable.

However, in the more conservative / formal forms of English, optimal is non-gradable, and better optimized should be preferred.

"More optimal" is grammatically correct but logically meaningless. In other words, there's no grammatical problem with the phrase, but the meaning of "optimal" is logically incompatible with the meaning of "more."

Since the intended meaning of "more optimal" is fairly easy to infer, however, it's not exactly semantically meaningless (as I at first claimed), and I think the particular usage is common enough to be considered fairly idiomatic.

There are certainly better ways of phrasing the same idea (I like the suggestion of "better optimized" from the first comment on the question) that avoid the logic-error of the original, though, so in practice I think it's best to avoid "more optimal" if possible.