Hello, I was wondering if anyone knew if there was some formula (or even better, some online calculator) that tells me what stats would be on gear that is level synced?

Since I bought the PvP set I wanted for glamour already (now I just need to grind the rank), I was wondering if there was perhaps some way to increase my performance/stats in frontlines. I was thinking of purchasing the i90 gear for lancer and then using materia slots to max vitality. I think some tankiness, even at the expense of some damage, would help me a lot (I'm at 4250 HP right now which is barely enough to survive a melee LB in Slaughter). Before I go spending wolf marks on an old set that isn't even that great looking and spending money on Materia, I wanted to see if I could tell what the stats would be compared to my current set, to see exactly how much damage I'm losing and HP I'm gaining. Any tips on how to do that?