What’s this Jon, you getting tempted to ride uphill as well as down!
I’m not surprised you’re slow with supertackys, I’ve got a pair of 2.25 Crossmarks in 60a and they’re hardwork for general CX duties, but really good at CyB and the like. For more general XC rides mega soft tyres take such an effort to keep moving that you can’t get up to speed to use the extra grip.
If you want I’ve got some panaracer rampages you could borrow. Have moved over to stans and don’t trust them to stay on the rim without a tube inside after a couple of issues with a pair of fire xc’s i’ve got. Let me know if you fancy trying em.
Mavic 719’s would be my rim of choice, a bit more robust than 717’s and the extra width is good for bigger tyres, only a bit heavier as well.
I can take you out on a training circuit with Matt if you like, I’m sure we’d soon have you in shape…