Something to note - the arc that will require the most animation budget and has the most horses is the 1st Stage - after that the actual horses going at high speed are really only for a limited time and there are some arcs that don't feature them in a heavy capcity at all like Sugar Mountian Spring

I wouldn't mind if they just have the 1st stage as one long episode and then go weekly. Releasing the 1st Stage at once might work for it considering its fast pacing.