I've never taken anything bigger than a heavyish PA28 into there, but never found that I needed more than half the runway in that. The grass stops you, and the slope gets you off again!
Lovely spot, great views, very friendly, and fuel always seems to be available, even if food isn't beyond a reliable cup of tea.
I imagine that a PA32 on grass is much like a PA28 on grass. Can be a little squirrelly below 40kn if the grass is wet, requiring you to be quite active on your feet. The standard safety factors for grass work reliably, keep the stick fully back to improve braking on landing, and use two stages of flap for take-off.
G