First, No offence, and I really like your idea about remake FE5
Second, it seems that you have absolutely NO idea about how important a stave miss can be, especially when you try to minimized the turn and have your stave user gain some decent experience but do not want to waste staves.
Third, i recommend you try to play FE5 to completion with a different strategy, to find some fun other than simply silencing/sleeping/ enemies with a 100% hit rate stave, or silenced/slept by enemies with those 100% hit rate staves.