When I was taking a course with Sepp Holzer in Montana he taught us to smack the logs really hard with a stout stick (club) when they just start to fruit. The shock is supposed to somehow cause a vigorous flush of growth, but I didn't understand the explanation when Holzer's translator told us why this happens.
Would you consider trying this log smacking method with one log and letting me know if it worked for you? My farm is in Central Texas, I haven't tried mushrooms yet.
http://www.1880farm.com Central Texas, USDA Zone 8b, Temperate Grassland, 34″ annual rain, 52 acres of bottom land, with approx 4-5 acres in young woodland and 2.2 acres in ponds (or tanks, as they are called in Texas)