As tough as the Mythic Spitfire is I don’t think it would cope with 15ft drops, or their warranty department wouldn’t! It’s more of a singletrack shredder than a cliff jumping bike. The next model up is the Rune and that’s very popular on silly stuff in BC I believe.
Cove seem to have taken time off from growing their own to design some new frames that are allegedly just as durable but much lighter than previous years. The new Cove G-Spot looks like it would hit your spot and is based on the larger downhill Shocker but with just 6″. You can guarantee Cove will have built something to withstand Canadian North Shore abuse so 15ft drops would be no trouble.
Of course the Orange Alpine 160 may not be a very pretty bike but they ride fantastically and and is basically a mini 224 so I am sure they would cope. Some don’t like the single pivot but the one I tried in the Alps felt fantastic. I watched a guy in Chatel on one massively over jump the big canyon gap and knock himself out with a horribly heavy landing. The Alpine 160 didn’t have a scratch on it!