The wheels should turn without trouble although you will hear the brakes lightly rub the surface - a gentle 'Sshhhh' sound.
Follow dwalby's advice re the fluid level.
Check that you have nothing between the pad anti-squeal plates and the back plate of the pads. No heat shield, no bits of grit. The clearance for new pads is minimal.
Check that the pistons can be pushed in all of the way - by thumb pressure. (Ensure there is room in the reservoir - handlebar reservoir for the outer two pistons, rear reservoir for the centre piston).
Check that the front axle is properly mounted. If the left hand fork leg isn't flush with the surface of the fork, then your callipers will not be in the correct position in relation to the disk rotors. With the brand new thick pads, this could be causing one pad or the other to be in more permanent contact.
See the thread here.
Any noticeable drag on the front left calliper could (as heat builds up) activate the SMC which would cause drag on the rear. But if the SMC is OK, you wouldn't notice this just spinning the wheel with the bile on the centrestand.
Check that those small silver clips which locate in the callipers to accommodate the tab end of the brake pads are the correct ones. Rear one has a ridge on it, with a corresponding notch on the tab of the brake pad. Front one does not. If the rear clip has been placed on the front calliper, the pad will get stuck.