I have BM's, Rats, Zancudos, a CS, Bucks, SAK's, an Opinel, and LM's that fill your original 2 criteria (all my Spydies are 3.5" or larger). For knives in the 3"range, the only one I really find a hard time rotating out of my pocket is the Buck 112 (dealer exclusives with a DP, but the CP is nice too). One of these days I'll give the Duke 500 a try.
I'll give a nod to the Opinel, but I modded mine to my preferences and it takes longer to lock open and close which many don't like.
I'll give a nod to the Opinel, but I modded mine to my preferences and it takes longer to lock open and close which many don't like.