You caaaan use an injector head with a shovelhead bowl but I don't as the head touches the herb and it isn't a good fit
I dunno what the 18mm Elev8R bowl is like but I thought their 14mm added too much restriction for my liking, and there wasn't an 18mm option at the time so that's why I bought the Qaroma one (which has better flow and dimples to hold the screen in altho it doesn't make a great seal with the injector to be honest)
just curious, someone said there were 22mm glass bowls for the standard version. are those worth grabbing and having both options? or is there con to doing that?