I hear what you are saying however, the person reading this group and
reads a post about "bubbles in a tiolet" is probably searching for a
similar problem and not "building their dream house."

In the case that someone was reading this to learn about improved
plumbing, what would they have learned? The only thing you offered is
that my system is "flawed" (without knowning anything about it) and to
"add a few more feet of vent pipe" which in my case would do absolutely
nothing.