I was playing modern cavities for about 5 years and my hcp fluctuated between 7 & 10.
For the past 3 years I started collecting and using old 1970 to 1990 blades. I swap iron sets every month or so for bit of a change.
After 3 years of using old blades my hcp still fluctuates between 7 &10. Difference, my next new set costs $100, not $600
People tend to forget that in the years before "cavity/GI" became fashionable, EVERYBODY PLAYED BLADES.