I'd be careful before detuning your edges. Reason being, once you detune your edges, it's a one-way street from there. There's no going back. So you need to be sure you're going to be doing park, and nothing but park if you bevel your edges to 85. If you say you'll be doing 60% jibs and40% mountain... I'd rethink the edge tuning before going ahead with it. There's a sticky on board maintenance and Tuning here, read that up. It will provide a wealth of useful information for you.