A spit patch is your cloth ball patching that you spit on for lubrication.
Not reccomended. It can dry if not used immediately and is not consistent and questionable if the best.
Another lube like a beeswax and oil (peanut, olive, canola, etc.) mix is much better and will serve you well.
Sadly, the best ball size for your gun can only be determined with use. The .730 might be fine but it also might be too large. Buying two or more moulds to get the right size is not unusual, albiet expensive.