I tried putting my blade in Airfryer and it worked: https://www.tabletennisdaily.com/forum/topics/blade%E2%80%99s-weight-depending-on-humidity-how-much.38387/post-551857
Okay I succeeded in drying my wood - put it in Airfryer at 80oC in 2 mins (don't put in microwave oven or the carbon fiber will catch fire) - and it reduced the weight by 0.8gr !
many people I know lacquer their blade's handles for various reasons: sweaty hands, handle may become dirty, or easier to sell the blade. I don't because it will change my hand feeling :p
yes the humidity makes a huge changes in play, like in Vietnam in the most humid days the tacky rubbers becomes slippery. I guess the blade will absorb some. Let me try to dry out my blade to see if there is any changes in weight
I also wonder: does the blade's weight and properties changes after years of playing (my King 3 is 9 YO). It seems with blade lacquer it can retain it weight (mine is 89gr now - almost the same since unbox)
I played with 38 degrees H3 on BH (and now H8-20). For me 38 degrees is the safe bet for both FH/BH, it has more power than 37, easier to hit through than 39.
The higher degrees you go, the stronger your strokes must be to prevent bottom out. That's why counter looping is easier with harder...