Been sizing wrong on the cheap tickers

Spent years telling people to size by risk per trade and never once adjusted for the fact that the spread is a fixed cost per share, not a percentage. That guide on why the spread has a floor made it click on the train this morning - on a $8 stock that penny is a much bigger bite than on a $300 one, and my sub-$10 positions have been quietly bleeding more than I assumed. Redoing my sheet tonight.