Straight forward stats question

[StellarWind]

You can do very nicely with a 19% PFR assuming it's the right 19%. Most of the money you win comes from a relatively small number of good hands. Of course you are leaving some money on the table because you are folding a bunch of marginally profitable hands.

I'm assuming that you do not follow up tight preflop play by being too tight on the flop. That is very common and would be bad.

Overly tight play tends to lose effectiveness over time as people notice and begin to steal more.

One thing about a 2/4 game is many people almost never steal. You must not overdefend your blinds against these players unless you want to lose your shirt. Loosening up isn't always good.