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@gbj_tester
The clearances are huge for a reason if you're thinking of going anywhere with mud, you should leave about 10mm radially and 5mm axially or you'll find lumps of scenery trying to stop your wheels from going round. If you fill up what looks like a load of free space under the fork crown with tyre, you'll severely limit your off road options. If you want more volume, get wider rims - they will increase your current tyre width a bit while slightly decreasing the diameter, so clearances stay about as they are, but your tyre volume goes up, your contact patch gets wider and shorter for better handling, and your rolling resistance can be maintained at its current value with lower pressure, meaning more comfort and better grip.
If you really must get bigger rubber, measure the clearance between the chainstays, as that's usually the limiting factor.