Jesus how fast were you going that you were in 4th at WOT. 
At first I thought it was probably shift knock but then saw you were on the stock turbo and injectors with who knows how much timing.
I'd find out your Duty Cycle and hope your not over 100% and really running lean up there.
And when you say 4 on the alky kit do you mean the 11 o'clock position??
Here is what I've learned if you want to enjoy your GN, tune for absolutely zero knock and don't get greedy with boost unless you're over the top on octane etc. I'm 22psi at 25 degrees with Meth at 1 o'clock and 5 gallons of 110. I'm running 99 octane with Meth injection at only 22psi and 25 degrees, pulls like a mule and ZERO knock even at the top of 3rd.
I've learned it's not always how hard you play, but for how long you're in the game. 
__________________
Mike
87GN T-Top down 423lbs.
Rebuild #2, BLK/BL Paint w/Custom Metal Flares, VPE Stg 3 Heads, 210/215 Roller Cam, TA49, V2 w/Blitz Blow Off, Billet Drum/Input, PI 3400 5disc, T Brake, Inland 3.5" DS, KB Plenum/70mm TB, Razor's Post Turbo Alky Kit, Devils Pre Turbo Alky Kit, 60lb Inj, Denso 280 Pump,-8/-6 SS Fuel Lines, MBC, Pwr Plt, PTE Oil Relocator, Preluber, Z06 Maf, Translator, Volt Master, Poston Headers, THSS 3.5" DP/Test Pipe, SS 2.5" Y Pipe w/No Muffs, PST 2" Drop, Poly Bushings, Boxed Upper/Lower Arms, QA1 Shocks, Vacuum Converted, Aerospace 11" Brakes w/SS lines, Alum Drums, Polished Autodrags 15x8/15x10, Nitto 555R 275/60's
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