Just saw this on ebay £495
https://www.ebay.co.uk/itm/394560784902?mkcid=16&mkevt=1&mkrid=711-127632-2357-0&ssspo=rdlR9yehTTq&sssrc=2349624&ssuid=zMJkWL26Spi&var=&widget_ver=artemis&media=COPY
Evoflash don't know if this is of intrest but saw this on ebay new £495.
https://www.ebay.co.uk/itm/394560784902?mkcid=16&mkevt=1&mkrid=711-127632-2357-0&ssspo=rdlR9yehTTq&sssrc=2349624&ssuid=zMJkWL26Spi&var=&widget_ver=artemis&media=COPY
I've used a G30 for a couple of years now and at that price I would not hesitate to grab it. If you go to grainfather website they have done a price realignment and the v2 and v3 are now £749. I suspect b2b have a few v2's in stock that they want to clear as they don't want to be left with them...
That is what i did and it worked a treat but the flow rate is a little slower.
Brewkegtap also do a kit that yses stem reducers but if you email them they will make one up with 1 stem rebucer and 1 inline reducer so you can leave a little 3/8ths on the barb fitting.
Beer line 3/16" Restriction Kit
Are you using 3/8 beer line ?
One way is to make up a beer line reducer replacing most of your beer line with 3/16. Have a look here at the pic and you will see what I mean its under more product details..
Complete Dispense Set Up with Optional Keg(s) - You choose your ideal keg
I think they do...