Anchor roller configuration

[pianewman]

I have a photo of Denny's (Bushwacker) setup, and the anchor pin is not in line with the roller/cleat, but off to one side. This makes sense, to keep the anchor line from chafing on the pin while anchored.
Is the Starboard under the roller necessary? Isn't the deck properly supported from underneath with the 2 triangles of 3/4" plywood?
I'm doing the same project on my '71 Seafari, but discovered the balsa core is completely shot (NO wood in a 20" diameter circle around the anchor line pipe), so I'm fixing that first (scored coosa per: Islandtrader's advice). Then I'll follow your lead, although I'll epoxy two or three 1/4" plywood triangle's underneath. I believe I'll need the flex of the 1/4" to maintain the original crown, so I'll glue them up one at a time.
Any advice welcome. Thanks.