Make your own brother.i like the orbiter whip with the 14mm gong.its very clever how it fits together using a stem inside the hose to accomodate the 14mm glass on the outside.i added an 18mm angled hose adapter on the UFO mouthpiece gong.herbie looks a similar size too.
I tried different size hose initially and now work with magic flight size hose .its relatively cheap.it has a narrow bore and retains flavour imo better than EQ hose mainly due to less air volume and Vapor soak in that airstream.
i don't find the pull restricted at all.i mainly crank temps up and hit it hard for 6 seconds or so like a sub and hold on tight. I picked up different cheap gong and hose adapters with orders over time or used what i recieved with other vapes to make up a good configuration.
With mouthpieces.i use a magic flight stem .it's comfortable.i like traditional delrin pipe mouthpieces too and not a fan of big lip spreading mouthpieces
But yeah ..experiment and have fun.sometimes making shit is half the fun
Have a dabble.