Yeah lose the Superslab at least til you are on the way home with the wind behind you and your butt ready to long haul. I'd highly suggest a 1000km day before you go just to test your tolerance.
Also - if you do wander and get lost having water with you is vital especially in some of the dryer states and provinces.
On the slab it's not a big issue except you have to remember to hydrate.
Starting early on the way out keeps the sun behind you and the wind will be less that time of day.
Dehydrated and staring into a setting sun is instant headache and disorientation after a long day riding. YOu'll make basic mistakes like highway hypnosis.
The best for hydration on a sport bike might be a camel back as you are going to space challenged anyway and you don't need to stop to hydrate.
I really hope you do some long rides ahead of time.
One good one would be to loop up to Tobermory - try and time it to catch the last ferry of the day to see how good your judgement is.
That's about a 600k loop but instead of coming straight back down I'd swing along the lake to Grand Bend and then home adding a couple hundred more.
Be cautious with fog on the Bruce - can be big time thick - very stressful riding.
Happy to do some intermediate loops with you when I get back in April.
You could of course do The James Bay road which will test your strategic planning

and give you a taste of a 1,000km day ( to Matagami )
I'd suggest getting this moved to Touring where it won't disappear as quick and you can benefit from the other threads that are there - can't hurt to ask.
The other thing is don't count on cell service or wifi - get some paper maps. I do like having a compass with me as you can get turned around and they are small.
That second map is way better but you are right on top of Yellowstone and that should not be missed. It will get cold in the mountains so your layers are critical - skip cotton completely.
Doing some spring riding with colder mornings and hotter afternoons will test your layers. Hands may be vulnerable as well.
A thin balaclava packs small but can help a bunch in nippy weather - Oxford makes some. - keeps the earphones in as well. Assume you are wearing earplugs or earphones?
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Good advice whoever mentioned tires and for sure pick up a CAA plus membership - cheap protection for a breakdown in the middle of nowhere.
Good maps available too.
http://www.caasco.com/membership-savings/member-benefits/