Terri, I'll go with the misspelling of my name as a honest mental lapse/typo and say the last time I had an odor like this I found a dead bunny and a skunk in the (hand dug) well.
I see a UV light, do you have Coliform bacteria in the raw water or was that added for another reason? Is it a class A or B, what is the UV intensity rating? Brand name? GPM rating/size? Do you replace the bulb and maintain the light per the manufacturer's instructions?
Tom's is going to need a lot of pictures.
The two banger, is that a regular (1 resin tank and a salt tank) or twin tank ( 2 resin tanks and a salt tank) softener? How old is it and somewhere in what you said you said softeners, as if you have more than one, how many do you have?
Why was a new well drilled and how far away from the old one is it? Are the wells rock bore (into bed rock) or cased/screened (in sand and gravel)?
How many people in the house and how many bathrooms? Any large tubs or 2 person showers or body sprays? What size softener (in K of capacity or cuft)?
Is the guy you live with more handsome than handy?