Thanks guys, also it turns out my milk math was off so disregard that. I had my wife (she's the clever one) do it for me and we mixed up the numbers while texting lol
We did 1L/day this winter and had no problems, split into two 500ml feeds. But that was with whole cows milk instead of replacer. I think you guys are right that 1.5L or replacer would be better if we go with that.
We had a group of 4 bottle bucks just to test. We also weaned them onto corn and have had no problems with it, they're almost the size of the mother raised babies. These are terminal kids at 12 weeks now, going to market for easter. The keeper doelings get an alfalfa/beetpulp/corn mix. Everyone gets unlimited hay, and they get their grain in the mornings.
Part of the reason I switched to just corn is from speaking to a few other producers who do just corn or 50%corn/pellets. One of them does straw for fibre, one does alfalfa, and one does grass hay.