You don't "need" to min max your Novus, it really doesn't change that much in terms of dps due to them being secondary stats. The whole reason why the fail chance exists is to make it so that it's a better idea to spread out your stats unless you've got holes in your pockets. There's also a high chance that once we enter into the expansion that the Novus melds will stop being relevant after we upgrade the relic weapon past Nexus.

Personally I try and meld Alexandrite as soon as I get them so that I don't get footed with a large Materia bill just because the market is booming that day.