Where to finish those pesky grenades?

[jason davy]

On my little pirate, I have taken the advice of everyone here on the forums and leveled my grenades non-stop since I got them.

Big John is now notoriety 23 with grenades at level 22.

I've searched the forums for the grenade guide(s) but I can't seem to find any SPECIFIC advice on where to go from here. The Kingshead mob turned grey at grenade 22. I have tried the catacombs, but Big John still gets killed there wayy too easily, even with my big pirate healing him. I've also tried Padres Beach, but it just goes much too slow there.

Does anyone have any specific advice on where I should go to finish off grenades? I absolutely can't wait to master them at level 40 like I did on Jason.

Thanks.