I agree that you're probably using the clutch too much, but probably not doing it much harm. However, all this clutch slipping does worry me a bit.
I think you have a fear of having the clutch fully engaged at slow speed and that's probably due to the fact that you're a new rider and just learning.
There is a sweet rhythm between the throttle and the clutch that has to be learned so that you're not jerking back and forth at slower speeds.
You may also have a fear of the bike getting away from you, but that's normal too without experience. Just don't let it overcome you.
Ride at your own pace away from traffic as much as you can and it will all come to you and confidence will grow.
I wasn't born with a motorcycle licence in my hand. All of us had to learn too 
Feathering while making a U-turn is normal to keep your balance (depending on how tight the turn is), but making a normal 90 degree turn at an intersection for example (if that's what you meant) isn't.
My fear is that you may be forming bad habits that will be hard to break, but with more practice you should be able to overcome that.
If you're inching along on 2nd you shouldn't be slipping the clutch. Either let it fully engage of hold the lever all the way back and coast a bit.
As the bike slows down let the clutch out and give it a bit of gas to get back up to speed. Repeat as necessary. Change gears as needed.
But of course if the bike starts bucking in 2nd then go down to 1st - or up to 3rd as speed picks up. The bike will let you know when things need to change.
Holding the lever all the way back isn't slipping and is doing no harm whatever.
Too bad winter is coming and your riding days are close to an end until next spring. You could use the practice.
I wish I was there to coach you 
BTW, I've ridden on route 1 from Calais, Maine, south through NH and beyond and loved it!!
I've also ridden all over Vermont and NH and loved it!
I love the coastal roads and we have a lot of them here 
