I would say based on personal experience and advice from multiple bike fitters, the number one cause of saddle sores, on the same side, is saddle height.
It’s possible your saddle is too high.
Lower your saddle. This fixed it for me overnight.
It wasn’t , bibs, saddle, chamois crème, hygiene etc etc. Those need to be on point too or you’ll still get them.
I now don’t even bother with chamois crème. I very rarely get a saddle sore. Maybe once or twice a year riding over 17hrs a week, year round. Previously, I had them constantly. When I do get one, it’s from being lazy with my hygiene after a long ride, because I’m tired.
Finally, the world tour pro tip for saddle sores. Buy a pack of Heavy Duty Elastoplast plasters. Put one on any new saddle sore after you’ve washed. Then, just leave it on until it goes away.
Yes I know, this sounds like madness, however it’s worked every time. I’ve never had to skip a single day. The plasters are very strong and stay on through showering etc. I didn’t come up with it. I heard it on a podcast with a world tour pro.
Game changer.
The cramp, that sounds much more complex. Cramps are not actually just hydration and electrolytes etc. Most cramps are simply from muscle strain beyond your current capabilities. This is why they usually appear in races or any harder than normal effort. Basically, your muscle loses control, because you smashed it. Normally, if you get one it’s because you are not adequately trained for the race, ride length etc. Or, never did any race simulations to truly push yourself.
Obviously, poor hydration and electrolyte consumption just exacerbate this.
If you’re routinely getting them in training, you’re either greatly extending yourself without adequate base training. Or, by significantly ramping up your duration of exercise, without doing it incrementally.
If you are doing that all appropriately, I’d look at position on the bike. Carefully check your cleats and alignment etc. Get a high level bike fit and make sure you do the required strength work, either in the gym or at home.
Long term road cycling is brutal on the body, it’s miles from a functional full body exercise. Without adequate off the bike work. We all, eventually break, especially older athletes.
Hope that helps.