If I am translating your first sentence correctly, and I'm not certain about that, your saying that you had forcing cones lengthened and porting done at the same time, If that is the case then you cannot definitive say that porting reduced recoil since it may have been atributed to the longer forcing cones.
A lot has changed in 30 years and I certainly have better things to do today than argue on a forum!
You and I most certainly are in agreement that red dot is not a soft recoiling powder.
As for your magazine article, I don't have time to read that but I will say this, magazine writers are in the business of promoting the business they write about and not nessesarily what is correct.