I don't think any cross tyre is going to be that comfy? I'd personnally get some Landcruisers and run them at a low pressure.
I don't have a huge amount of experience of cross tyres, only Landcruisers and Michelin Muds. Landcruisers are bomb proof but not the best feel to them. Surprisingly grippy though considering the design and also last a good mileage.
The Michelin muds are my race tyre and have a nice fast springy feel, but are not solid and I wouldn't recommend taking them anywhere near rocks.
I'm actually after something thin as I always suffer from the bike clogging up in the last 10 minutes of a race and I don't have a spare to swap to.