Okay, so I've had a little success on this issue!
It's not perfect, but it is close enough that I'm not bothered by it anymore....well, as much anyway
What I did...
I faded in and out the beginning and end of the hum, respectively, by about 1 second. Then I chopped off about .5 seconds off the ends, so it didn't fade off completely. Then I uploaded as usual, and the transition isn't as harsh anymore. Sometimes it's close to perfect, but I think some of my swings have different levels on them, so there are some variations. Maybe this will work for you.
Hope this helps!
Will see about giving this a go and working on the clips today, thanks again for your help.