Thing that killed it for me, I found a custom sniper rifle (only good thing to come from Naa Sadaa) looked at it and it was -98 max damage, no mod would be able to make up for that.
This is where you're wrong.
Most (a lot) of is use the orange custom weapons/gear that we have had for most of the game, just keep slapping in upgrades.
Transferring stuff to alts... mail.
Buy the cheaper version of legacy gear to transfer the bound armorings,mods,enhancements,barrels etc...
If it's unbound just mail it without putting it into gear.