Is there a secret in building !” over std graphite irons?

The 4 iron head weight is 252 grams and shaft weight is a reg 73 grams graphite with a 3.7 torgue.

The only way to get the swing down from E1 was to back weight the 39.5 inch club.

With back weighting the club, I got it down to a D4.

Any tricks for getting the swingweight of the club down that I’m missing?