[N1ceDrgn]

When dealing with turbo, running hotter, a little, is not a bad thing. Just getting a good balance between fuel and spark. You need to keep a good balance. I was running with NGKR 8's for a little while, I turned up my fuel as well though. I stopped after I burned my turbo out. Running hotter, getting a cleaner burn, better compression leads to better spools.. always a good thing.. Once I get my bigger turbo on, I'll probably go back but for now, I'm running normal plugs again..
Bottom line, in my opinion, hotter plugs are not a bad thing, as long as you balance out the spark/ heat with a way to cool it down. Either water injection or turn up the fuel pressure a little.