Update on plug gaps, finding the info on these is difficult, Walkerstrider is running his gapped at 20thou and it runs perfectly, I've also seen one other person quoting the gap to 20thou too however, my car does not like 20thou and misses a lot on tickover. I upped the gap to 25thou and at first it seemed to help but it then started missing again (only on tickover) so today I have upped the gap to 32thou and it is so much better with the miss being almost eradicated (hoping this will be cleared up with the map).
The reason you bring the gap down to 20thou (from the factory pre set gap around 1.1mm) is because the spark is usually affected by the boost and "blown out" which causes missing at higher revs but as I have found (and I don't know why it has had this effect on my car as from what I can gather everybody else runs at 20thou fine with no issue) it is not always the case, mine runs perfectly at higher revs gapped at 32. One tuning garage in America suggests 28-32thou for anything up to 15psi.
I hope this may be of some help in future to anybody who goes N/A-T and has a misfire on tickover but does not know where the fault lies,(having already messaged a couple of N/A-T guys on here for help and info but with no replies) I found this out after changing the fuel rail, injectors, Y plenum, TPS, IACV, plugs, leads, rotor arm, coil, igniter and map sensor, also did the 12v fuel pump mod (standard pump).....none of which helped the misfire.
I would also urge anybody who does go N/A-T to definately change the fuel pump for a 255lph as this makes a huge difference to how smooth it runs.
Just to add this is with BKR7E copper plugs.