Keeping some woods stable is difficult , My bass guitarist friend travelled the all guitar shops and tried 90s Fender Jazz Basses new , all sounded excellent with rotten necks. All guitar shops were complaining about the quality of maple of Fender.
Wooden instruments lost their interest to moisture only after 100 years when all wood turn to crystalline.
Thats why all major violin makers preferred the old wood collected even from Swiss hundreds of years of age wood buildings.
Try to buy wood from a instrument maker who collects them from grand father to father and son.
Maple,Oak,Mahogany is heavy weight woods and I can give you a tip to stop rotting.
First take a piece from your collection , saw it long two pieces and turn one piece to 180 degrees and glue these two piececes again.
If one piece rot to one side , other piece stops it with reverse force.
Other tip is to saw the wood to two pieces and place a third or more other pieces to the gap