I won't bore you with the details but I had chronic shin splints that lasted a couple of years and was also getting that horrible tight pain like my calves might explode as you've described - I was also worried that might be compartment syndrome. Anyway as a last hope I took a chi running workshop. Within two weeks I had no more splints and I haven't had them since. I suspect any form based running would help as I think it's predominantly cadence and body position related. This is obviously all just my experience but no amount of rest helped me. Strong glutes will always help though. Good luck!
I'm only here because I heard a wild rumour that I may find the cure for the common cold bum here.
This will be Paris Mark 2 for me. I did attempt it last year but had to pull out before . I'm oddly nervous of making too much of this attempt in case it fails. That's why I've so rarely been on the thread. Minds are peculiar things. Anyway I send big waves to all and hope everyone's training is going well. Hopefully I'll see you all in Paris.