I want to replace 105 gm True Temper DG SL R300 shafts in my 3 and 4 TM RAC LT irons with lighter 78 gm graphite shafts and keep a D1 swing weight.

I have 2 untrimmed .370 tip Cleveland stock CG7 graphite R flex shafts that I want to use.

Do these graphite shafts play close to TT DG SL R300 flex or are they stiffer / softer ?

I want to know how much to trim the tips for 3i and 4i for A flex and also how much more to trim for R flex.

Do you think I will have difficulties with getting to D1 swing weight with these lighter shafts in the TM RAC LT heads ?