Currently with the max of 300% productivity only the first 6 levels of the research are actually impactful which makes the point of the infinite research kind of moot, maybe have the infinite levels give +10% per level like the vanilla levels or make it only have 6 levels of research?

Currently with the max of 300% productivity only the first 6 levels of the research are actually impactful which makes the point of the infinite research kind of moot, maybe have the infinite levels give +10% per level like the vanilla levels or make it only have 6 levels of research?

I have thought of removing the 300% prod. limit myself, but since I have a couple of productivity mods, it would make more sense to have that be a separate mod. Either way, I haven't got around to making it, so I would suggest you find a different mod that removes it.

I currently like the 50% prod. bonus per tier, since it makes reaching the de-nerfed state easier. You actually need 150% prod to reach the de-nerfed state. And I don't want to directly alter the recipe itself because of (1) compatibility with other mods, (2) it's less intrusive to the base game and (3) it doesn't scale up with research. Since reaching the peak feels kinda bad, but I don't have a solution for you, I recommend that you install a mod to remove the 300% cap on productivity. I will get around to making my own one of these days.

Currently with the max of 300% productivity only the first 6 levels of the research are actually impactful which makes the point of the infinite research kind of moot, maybe have the infinite levels give +10% per level like the vanilla levels or make it only have 6 levels of research?

I've gotten around to it. You can find the mod to uncap the productivity here: https://mods.factorio.com/mod/remove-productivity-cap