Tour players always say they don’t hit their irons full, their “full shot” is only 80%.
The 80% is a misnomer. It’s more like 90%…or more. Actually, it’s 100% of a controlled swing.
I spent 6 weeks on the PGA Tour last year and have played with several of them. You are mistaking what they mean. There is a full shot where it is 100% of a linked up swing. That is the stock full yardages they use on a regular basis.
Then there is the swing where you disconnect it for extra distance. For me a full swing PW is 135, possibly 140. I can extend the armswing and pull the handle too hard and hit it 150-155.
The 135-140 is a full 100% swing. The 150-155 is something I only pull out when a speciality shot is needed.
Most high level Golfers have the same thing.
When I see a 10 handicap with 110 mph driver max hitting PW 140-145 yards, they are using that out of control, specialty shot action.
So again, there is no need for you to dial down as the so called 80% tour swing is not dialed down, it’s just not an over swing.