Conti Cyclocross Speed and Race are different tyres, so be careful not to confuse as some may have done on this thread.
I fitted my wife’s bike with the Race version (more knobbly, like a mini MTB tyre) and they’ve not punctured once.
My Speeds (tiny knobbles) rolled brilliantly on the road – but I gave up on them recently after 2k miles / 12 months’ use, as I’d had 4 punctures in one week and 15+ over the year!
I, too, use Crest rims and that limits realistic choice to 35+ tyres. GP 4 Season was my favourite tyre before that and so I looked for another tyre in Conti’s range with Protection casing. I also looked at Schwalbe Marathon Plus Smartguard tyres, but these are nearly 1kg each!!
I finally replaced them with Conti Top Contact 37c, which don’t have side knobbles but are pretty much the lightest tyre with some puncture protection at 650g (still nearly twice the weight of Speed though). Expensive, too – but ace grip, longevity and puncture-free so far.