Dang I hate to ruin a good thread. OK here ya go.
Avon does not recommend the front Avon STORM 120/70ZR18, but they do recommend the rear Avon STORM 170/60ZR17. This is due to stabilty issues, I spoke to Avon reps countless times on this.
Avon does recommends the STORM 2's for the ST1300
Per Avon reps who I have spoke with a bunch.
Tire seating pressure? Well I have done this a couple of times. Some tires are better than others. I have put 60 to 70 in a tires to seat it. You don't damage to a tire by doing this. Tire manu's have recommend settings so that "Bubba" doesn't blow his arm off.
ME880 MT90-16 are the worlds worst to get to seat the bead. Just make sure that you have plenty of lube and that you lube the rim around where the bead will seat this will make it a lot easier. Storm 2's and PR2's are about the same when it comes to seating. Nothing special.
Ride On I know this is a touchy subject so I will give you my point view. We have changed tires with this stuff in it. Ride-on, Slime or any of the others out there are bad for your wheels.
It is caustic/corrosive, it will peel the paint, it will peel the chrome, it will eat thru a steel rim.
I have seen it first hand and this is all I have to say about that.
Ride safe and enjoy whatever tires you are riding.