You always Spod the lot that's how you will catch the big unis. Comps are different like Lucky Ghost Hunt, you Spod 0 to 4 times and stop. 5 Spods will catch a uni 40 to 50lb and the fish in that comp is a trophy 30lb. That's the fish that wins that comp.
Peas and Corn work as good as Boilies and cost less (i use strawberry, fishmeal, tiger nut, citrus). It's really about the Spod mix until you lvl up and get fruits from south america and the heavy bottom rods. You could use float rods just fish over depth. Always fish with the biggest hooks you've got at weeping.