Rickochet
When you are using an A flex shaft, it is hard to drop down a flex๐. Thus the light heads don't work as well.
I had always used 45.5 drivers. When Almo came out with the No Brainer, I had him find me one that was heavy, which those 1st ones were. He sent me a 206g head, open faced, and I got a special HOF shaft (62g) for it in R flex. Wanting to experiment I went with 47", but soon found that was too long.....shaft was uncontrollable with the head weight. I cut it to 46 and it was gold!! I've been at that length, sometimes just a hair longer, ever since. I've dropped to A flex, sometimes a soft R, as the heads are now around 202-204.