I'd just get a seperate wah. i have never managed to find a place in my chain that sounds better than as the first element in the chain. If the wah on your pedal sounds weak, then I'd go out and get a seperate one, something like a vox or a crybaby. I found that vox do really cool ltd edition
wah pedals that have an extended range, giving you more wah, and they are cool!
just my thoughts...