You can only have one druid imbue active at a time; on a wolf druid I usually go with Magic Fang, which on a druid 15 build is +4 (+5 if you're in a Primal ED or can otherwise boost your CL to 20). FoP is avg +5 dmg per hit, but doesn't effect fire-immune mobs and doesn't boost crits like Fang does.
Semi-retired Build Engineer. Everything was better back in our day. Get off my lawn.