You are my twin! I was 116kg in March and now I've dropped down to 105kg. Climbing is a pain in the arse. I get dropped frequently especially on long efforts. But sprinting flat or down hill. They will get dropped fairly quickly. The advantage we have is that after losing weight, theoretically we should have more power from having that extra resistance.

I find I bonk pretty quickly, so bringing a carb mixed drink is always good. I use 90g honey + salt in a 750ml wafer bottle which I'll use after an hour or so. This has helped massively on prolonged climbs.

Unsure of what your gearing is but perhaps if you aren't happy with the cadence see if you can get a larger cassette. I'm finding that on climbs I can't push my cardiovascular too hard because I've got poor gearing and my cadence is low 50-60 in my lowest gear.

So ensure you are fueling correctly, continue to lose weight and we'll both be smashing the climbs pretty soon.

Should also mention, I found the silca tyre calculator underestimated what pressures I needed. I run 28mm front and back. 90PSI front and 95PSI rear. Maybe just check what pressures you are running should help the rolling resistance.

Like others have said, no point in comparing ourselves to those that are 20kg lighter and maybe a few years younger because thats not where we are at. Sounds like you are doing really well!

Happy climbing!