Keep in mind that low charge weights of fast burning powder can get a little freaky. The guy shooting the 38 special load (148 over 2.7 W231 which is light even for a PPC target load) in a 9mm case could easily experience a detonation. Be very careful in going low with these powders, that's why there are starting loads in manuals.
^^ As usual he has it backwards. I am beginning to suspect he does this on purpose,to get us stirred up.
The short answer to your original question is to use less powder. 3.5 of TG should work perfectly.
If you want even less felt recoil, use a heavier bullet (not lighter, as SunShine suggests).
If you want to experiment, try some 147 gr plated or lead bullets. I load them with 3.3 gr of TG.



























