I recently had a go at the 'tropical' lap myself. My problems were different to yours though Neil, went overboard with the castor oil and now have a lap which is easy to cut channels into, but which I fear is much too soft. Think I will give it a few more goes with the resin to see if I can get it right before I give in and go with pitch.
My lap pictured here, freshly poured (but prior to trimming).
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