"Standard American", five-card majors and weak twos. The usual conventions like Stayman, Jacoby, and Blackwood. That's what the whole crowd, except for snobs who liked to fool around with Precision and Blue Club, played.
Do you mean Culbertson or Goren?
I've read a lot of Precision and Blue Club (Blue Team Club, BTC), but never play with these systems.
I guess my experience is not good enough for this system.
Even though five-card majors is dominant nowadays, and it seems everybody goes through the ritual of Blackwood to bid a slam, I dislike both. Five-card majors leads to a lot of 4-4 fits with the strong hand in dummy. Blackwood is usually inferior to cue-bidding.
What you describe is close to the swedish system called Modern Standard (MS), so I know exactly what you mean.
A strong hand should always be examined before you gave your final bid.
My ex-partner was playing just like that, I don't know how many times we talked about this and finally I gave up.