Mag stats contribute directly to your stats. If you want to pump up your T-atk some then maxing out BO tree's tech up skill will give you a good boost. Along with that, depending on your race/gender, you should be able to equip just about every jetboot at level cap. Until then your best course of action would be finding a jetboot with a good latent and using that. If you have the Photon Boosters for it, I would recommend getting the Red Jet Boots (赤のジェットブーツ

, grinding it, unlocking its latent (only need level 1) and crafting it to as high a level as you can. It will make for a solid weapon that will last you for a good while.
Aside from that, what is your Mag's stats? Having a plan can save some headaches later on.