I only use fan jets
I be found using the exceeed quick release system not had a blockage over a year now, I always carry set long pins just in case
As to the fan jets I always countersink them into the brush head I use a 11ml wood drill that's cuts a hole and snip a small section of the stem on back of the Fan jet off,
This way they don't knock or touch anything, there's no more issues then
I only use an extreme been telling Alex there brush heads should all come with counter sunk hole for fan jets for years now