Tomorrow, I am visiting Mayhem in Essex. a site that I have not been to before. A number of people have recommended it, but I am not sure it is going to be my cup of tea.
I paid as little as £32 for the Earmor M32 Mod.4 from AliExpress. There's really no need to go about buying from de facto dropshipping UK outlets - when you can buy them for as little as £26 (without PTT wiring) with free shipping, and a pretty straightforward full refund policy by AliExpress for if anything is faulty with the item.
How are you getting to £200 a person?
earmorstore.co.uk has you at £130 shipped p/p.
What you're getting for the extra over Aliexpress is no quibbles warranty access. I had a unit with a faulty cable, 10 minutes of back and forth in emails of diagnosis, brand new unit at no cost.
Most likely the connection between the nozzle and bb is off. Check if the nozzle is cycling properly. Get a torch and look down the hop chamber or something when you're firing. Maybe the bucking is off alignment too.