Don’t Crests have a recommended max rider weight of about 80kg, just like the 355’s had? In reality, they’re a lightweight XC rim for people with finesse, they’re tough for what they are, but I can’t help but think for your desired application it would be better to errr on the side of caution?
Anyway, at 14 stone plus 15kg of gear, I’d be less worried about weight and more worried about running something tough enough. Not overbuilt, but a Stans Flow would be the logical answer as its got a bit more to it than the crest so is stronger and will take the weight better, it won’t flex as much either. And your 2.4″ tyres will have a great profile on the 22mm internal rim width.
Though by the sounds of things, you’re not intending to run tubeless. I which case save yourself some money, take a look at the Mavic XM719 or EN521. Either will definitely do the job you require well, without being too heavy.