Yeah, those 2 string chords are fun, but one of them is kinda hard. All that sliding can add up too!
Haha, I’m sure all that practice is increasing your groove --both ways.
I may need to work more on slide guitar to save my fingers. 
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Consider yourself lucky that you get calloused at all. I don’t. I like to joke my finger tips are made of mashed potatoes. My skin is hitting the fretboard before the string is contacting the fret. When I remove my finger the groove sticks around for a long time before blood flow (or whatever process) causes it to smooth out.
On a climbing trip my wife is filing down her callouses by the end of the first week and my tips are seeping blood. She should have been the one to try guitar.
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Hi Paul, welcome to the community forum. If you are mountain climbing with your fingertips, then you are doing a lot more than I could ever do. I assume you are using an acoustic guitar, perhaps with a high action if it takes a lot of pressure to push the strings to the fretboard. You might need to consider trading in your acoustic for an electric guitar with much lighter strings or a nylon string classical guitar. You could also take your acoustic guitar to a music shop with a guitar tech or luthier and have the action or string height adjusted and restring with lighter strings. It may seem a little extreme but you could also apply liquid bandage to your fingertips to toughen the fingertips before playing. I have also used small circular bandages on my fingertips when I have had cuts on my fingertips. I even have a recording using my classical guitar with little circular bandaids on my fingertips.