I'd just suggest the following:

Instead of 2.3s cast with 2.5s recast, just make the main DPS nukes 1.5s cast, recast 2.5s. This would standardize it with other spells that allow for weave windows and, well, actually allow for a weave without clipping.

(Or IDK, maybe healers could get a mechanic like Ruin IV - that allows that healer to have flexible weave windows and choose when to use them, but not have them every cast?)

But regardless of how it's done, getting decent weave windows would be very welcome...