literally the textbook definition of a tsundere
It depends on your interpretation of how a 1.5x power thing works. Is it:Can you explain how you came to 2.25 rather then 3x?
A) Applied again (in other words, a multiplication)? That would be 1.5*1.5=2.25x boost
B) Has the chance added on again? This also raises the question of if technician for example is a 1.5x BP multiplier or a 50% increase in BP. So would be be 50%+50%=100% more BP or would it be a 1.5x+1.5x=3.0x multiplier?
The issue with B is that it is VERY much not the case for Fur Coat or Fluffy as you outlined, since no matter how you slice it you can't add up a 50% damage reduction or a 0.5x multiplier and end up with 25% or 0.25x multiplier. Instead, they'd be absolutely useless aside from Fluffy giving a 4x weakness to Fire type moves.