i know where you are coming from with your love for lightfoot. when i first unlocked it, it made me a MUCH better player. I still find myself wishing i had it sometimes, but you adapt once you stop using it.
I would say if you play better with it. then keep using it. once you find you need more power or more armor, then make the adjustments as needed.
I may go back to lightfoot once i unlock the ivana, we'll see. it's very hard to shoot someone who is strafing with Lightfoot.