Windlass mount support material Ideas

[abl1111]

The scenario: 23' Tsunami. I have had a Lewmar windlass mounted directly mounted to the deck of my boat for 6-7 years - with a pivoting anchor roller ( the windlass is the motor on top version ). Works flawlessly. I installed an oversized 1.5" thick pc of plywood under the deck for support - under the entire rig ( a be'atch too install and work on in the anchor locker )

This year, I noticed a slight flex on the top deck from the pressure of the windlass pulling on the anchor and possibly from leaving the rig tensioned all winter long ?!

Either way, I want to remedy. I was thinking of installing an oversized base for the windlass. Any ideas on what type of material would be best ? I was thinking teak or Starboard. If teak, what thickness would you think ? And what would be the best sealant to use to join it to the deck ? Or, the Starboard - my concern is that no sealant would bond well to it - for the deck/windlass joint or the windlass/starboard joint...

'Been there done that' input appreciated.