Plug readers: What would you do??

Some comments:
- I would try an NGK 7 heat range
- Do these Brisk plugs have a Copper centre electrode? If not, ditch them
- Probably one of the biggest plug problems is plugs that are too cold. Especially in drag racing when the engine is only at WOT for a few seconds.
- the description of the problem is one of a plug that is too cold. Centre electrode is not getting hot enough to burn off deposits; the deposits bleed off the spark energy; result is misfire & slower car....
- in my opinion it is a waste of time using ground strap colour to determine plug suitability. Take the Brisk plugs: the grd electrode is tapered & only covers half of the center electrode. It therefore has less volume of metal to heat up compared to plugs that have no taper & the grd elec fully covers the centre electrode. Then there is the fact that grd electrodes vary in width, thickness & overall length between brands; finally where the last thread ends in relation to the chamber surface is going to affect how the grd electrode is exposed to heat & consequently how it is going to 'colour'.
- the two electrodes should be filed to a sharp edge because electrons jump easier from sharp edges.
- use Irid or Plat plugs. For the same electrode gap, they require less firing voltage & are more likely to fire when conventional plugs start misfiring.