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I can see some logic in that although I've seen many 5 ply blades that are rated much faster than my 7 ply blade. There must be many other things that cause variations as well as weight and ply such as stiffness of the blade, hardness of the blade, type and quality of wood used, etc.It's a no brainer that your joola will feel more solid and faster. 7-ply in general will have less vibration compared to 5-ply. Faster as well. Then there's the weight that you take into consideration. 90g blade will be faster than the 85g version of the same blade.
if you've been using 7-ply for 2 years, 5 ply will feel pretty slow for you in general especially if you occupy the same general blade speed (ALL to ALL+)
As an aside, I recently found 3 blades which I used to use when I was young or relatively young! Neither has been used for at least 23 years! Does anybody know if these blades were decent in their day?
They are all Butterfly blades. The first is GERGELY ST and is in great nick. The other 2 are identical and have merely Butterfly written half way up the black handle in red and some sort of stamp in white on the other side of the black handle which is fading a bit so I can't read what is written other than is says Buttefly across the middle of the stamp.