Im always down to grind higher end mobs for loot/exp.. I agree we do need more people to start making grind/pvp groups. Also we should have a standard of what food/pots you should have on you incase of encountered pvp they make a huge difference.
Like this is what food i aim to have

Serendia Special
-Ham Sandwich x1, Honeycomb cookies x1, Life Saeal x2, Fruit Wine x2, Meat Pie x1 Damage +5, Critical Chance +5%, Accuracy +10 for 90 minutes

Media Special
-Dark Pudding x1, Oatmeal x1, Exotic Grain Wine x2, Grilled Sausages x2, Meat Salad x1 Damage +5, Attack Speed +1, Cast Speed +1 for 90 minutes

Fruit Pie
-Dough x6, (Apple/Grapes/Strawberry) x6, Cream x3, Sugar x4 Casting Speed +1, Max MP +70 for 90 minutes



There are more in verious guides online
http://blackdesertfoundry.com/2015/10/21/witch-class-guide/