I chose the equivalent of a 8 iron (36.5 inches) length for clubs from SW to 5i.
The set is divided in two types of club: soft feeling (from SW to 9i) and cavity back (from 8i to 5i).
I've tested them in January 2017 on the range.
Green in regulation
a) Green in regulation percentage has improved from 21.6 to 29.6% on average from 2016 to 2017 peaking to 44 and 56% for the last two rounds as I am getting used how to play single length clubs !
This represents a great improvement that allowed me to reach my ultimate goal: single digit handicap ! (my regular handicap was around 14).
An improvement of GIR from 21.6 to 37.6% reflects a potential improvement of 3 strokes for 18 holes, quite substantial then.
Results from inside 100 meters:
Single Length shafts in 2017: