Does a slick provide any more (lean angle) than a 211 or 212. The slicks i have look like u could lean alot more than the q2's i have been using? Just wondering if the gp's are the same proile as a slick?
You'd really have to go into the weeds to determine whether you can get any more absolute lean angle from a slick. Generally speaking slicks should have more grip so in theory I'd have to say yes, they should give you more lean angle.
The tire sizes are different (at least the rear) so the profiles should be different. Just because the front size is the same it doesn't mean the profile is though. They are using the USA slicks in AMA Superbike now so they are developing those tires to run on those bikes. The GPA's are being developed for the Daytona Sportbikes. The requirements between those two classes are very different so I would say the tires and constructions are different. It doesn't mean you can't run the slicks on a 600 or the GPA's on a 1000 though. I've done both and it's fine.
There are a lot of variables and the tires are constantly evolving, and the UK tires you have are different than the USA tires. Remember that a lot of things affect how far you can actually lean. Bike set up, body position, ambient temperature, tire compound; all this stuff is a factor. Ultimately it comes down to the rider as to how mow much they can take advantage of what any race tire offers over a street tire. I will add though, that I think you get away with more using a race tire. For instance a mistake you make on the Q2 might put you on your head, whereas the same mistake on a race tire with more grip might not. I think if you were to ask him Brubaker will tell you that any of the race tires they make will give you more available grip at any pace than their Q2 will. So as I said before, in theory that means you should be able to lean over farther before you fall. It's not a given though that you will actually go faster. That's up to the rider.
If you are trying to decide what is right for you here are the things I think you should consider (not what might give you more lean angle).
Slicks last longer than DOT race tires
The bigger rear slick might be a problem depending on how much room you have between you axle and the swingarm (how long you chain is)
Slicks are harder to sell as takeoffs (street riders want to buy DOT's)
Both Slicks and DOT's can be flipped front and rear
Price
If you just want to make the move to race tires then go with the GPA's and see what you think, you can always try the slicks next time around. If you are on a 600 probably a medium front and medium rear. Medium + rear if you want it to last longer or are on a 1000.