Is Your Centerboard Banging?

While hauled out last week I checked the centerboard and rudder wells and especially the slots where they come through the hull. The centerboard (or better centerplate) had slapped side to side at anchor and in mixed seas when Annie was first built. Several years ago with the help of my friend Jay in St. Augustine, we attached heavy plastic (1/4" thick) with stainless screws either side of the slot to close in on the plate and effectively narrow the opening. The slapping ceased and on recent inspection, they appear to be in good condition. The stainless centerplate always hangs a couple inches proud of the hull so it hasn't caught above the plastic and failed to drop. Something to consider?

Centerplate at the bottom right