No idea, using 720 Fahrenheit for several seconds I’ve never seen a measurable change in inductance, they’re a pretty tough construction.
I would definitely do them by hand, there’s just too much thermal mass for the way you’re doing them currently. I would strongly recommend getting a syringe of solder paste too; the way you’re mounting components right now is rife for cold-joints and unsoldered contacts, the problems will really become apparent as you go down in component size.