Setting up rear v brake on full susser

Potentially a dumb question, but this is my first v braked full suss.
Picked up a ~97 marin rift zone frame and fork at a bike jumble and set to my parts bin to see what I could turn it into. It's nearly up and running pending me finding a crankset with some life in it, but as soon as I load the rear suspension there is more slack in the brake cable and pulling the lever becomes ineffective.
What's the correct way to set this up? Set it up under load?
Looking forward to discovering what the early dt Swiss air shock and first generation bombers can do
Cheers
Picked up a ~97 marin rift zone frame and fork at a bike jumble and set to my parts bin to see what I could turn it into. It's nearly up and running pending me finding a crankset with some life in it, but as soon as I load the rear suspension there is more slack in the brake cable and pulling the lever becomes ineffective.
What's the correct way to set this up? Set it up under load?
Looking forward to discovering what the early dt Swiss air shock and first generation bombers can do
Cheers
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Pictures of your cable routing might help.
Looking at pictures of other examples the cable is routed almost the same, but with my sensible hat on I think it is probably just due to me not having replaced the brake cables + outers yet, and the ones I have on there are seriously vintage and oxidised, having been originally fitted to my ~2004 gt avalanche.