To put it simply.. yes, the Dunlops as a whole (including the Q2s) now are a different breed. (FYI, Q2's is the skinny hot supermodel daughter of the championship winning N-Tec UK GP race tires) Back on 04-ish, the AMA level Dunlop race team had released a type of tire called a New Technology (N-Tec) tire. These tires were different in many ways. 2 of them being the lower riding pressures (From 40 F to 33 F and 33 R to 23 R) and JLB manufacturing. JLB "basically" means that no matter how fast you spin that tire it won't grow in size. (To be totally honest, if it does grow it will be a matter of very very few millimeters).
This helps because if you have ever had a bike that was not quite right geometric wise, you might find that the bike will "waddle" as you ride faster. This was due to tire growth.
SO, giving a standard pressure of 34 is an all encompassing value. Basically the tire is so dynamic that 34PSI covers you for all the riding that you will do. The rear is more particular just because of the fact it's bigger and the power distribution tire.
Could I recommend you do 36 for street, 34 for canyon and 32 for track? ..sure. But it's not necessary. The Q2's are not that specific. (especially in the front where the change of values are only 6% where as inversely the range of values in the rear is 26%) The street tire is very forgiving and meant to work on a wide range of variables. My DOT race tires are not so forgiving and have a smaller range of positive usability. Slicks are an even smaller range.
I could, and do, tell my riders to use the race front at a 33 recommended front PSI. However, there are times when the weather is too cold or hot or the track surface is different from one place to another.. that's when we have to stray from the recommended pressure and use what works better (Because of the smaller usable window the race tires have). BUT the average (and even above average) street/track riders are not looking to gain the extra .2 seconds through peak to peak and usually not looking to gain that extra 2/10 of average MPH.
It simply comes down to being particular. You really don't have to follow recommendations. It's your tire now and you can do what you wish with it. We (Dunlop) have spent lots of money testing the tires so you don't have to though.
I could go on for a little longer but my wife might miss me after a while. LOL I hope I answered your question Sean and please feel free to ask more if any come up.
I am planning on doing a basic tire seminar before the race season starts. Just looking for a good central venue to have it.
ask on askas