Nice gains Rich!! What were your before & after boost pressures? Likely where your largest gains came from... also, what did your AFR's look like before and after?
As far as a Speed3 vs Speed6 highway roll goes... one thing to keep in mind, the Speed3 only weighs around 3153 lbs, whereas the Speed6 weighs over 400 lbs more at around 3589 lbs. So, peak power wise, on the HWY, I would probably bet a 222whp Speed6 would be pretty close to a 207whp Speed3, but probably wouldn't be able to pull, unless of course the Speed6 just made WAY more power under the curve, which might be the case, but we would have to overlay both graphs to see. Curb weight can really hurt a car like the Speed6

Either way though, congrats Rich, very nice!! I always said the largest gains these cars would see would be from EM & tuning, can't wait to see the final tune!!