I wouldn't manipulate it to such absurd numbers. In the past, people have reported that manipulations to such extents have caused massive problems with their saves.
This.
Whenever I use mods, I never use any which unless the dev has built-in within the game which he himself verified won't break the save (for example, games like "Ataegina" "Love of Magic" "Hail Dicktator" has those).
But any outside third party mods (not done by the dev) which gets player to change the stats, I just stay far away from, cause changing the stats just tends to screw around with game's variables and messes up the saves (if the person is fine with the risk of it all, then I guess it would be no problem for them, but as for me I just don't like fiddling around with things I don't understand so....).
Besides, I find grind for this game is actually pretty mild compared to other grindy games anyway.
It's pretty bearable even the first time around, and becomes pretty easy-peasy the more it gets repeated.
And I think this is a situation arising from there not being "Visual Novel Only" mode implemented yet.
As soon as Hopes applies that mode in a future update, I'd imagine a lot of these 3P mods will become obsolete.