Does it matter if I overlevel?

Yes

 

No

 

Will affect your mp, but barely

 

As long as SP isn't lost the reduction in MP will be minor and not worth remaking over in my opinion.

 

As long as you don't add SP into improving max mp increase any later than you normally would it doesn't matter much (it has a prequisite skill so you have some leeway).

At worst you'll have a couple less mp points but you can get those back by doing a single mp wash at a higher lvl.

So yea you'll be fine.

 

You disagree with my statement with it being a fact? It is a fact that his mp will be affected and that it is barely at all affected. That there is a solution to it (like mp washing once) doesn't change the fact you can't objectively disagree with me lol