Ok, here is the latest update.
Today I shaved with Mach 3 again and was successful at shaving against the grain at the back, well almost successful. My secret....dumb one but seriously a shaving brush!! I use the brush to put Gilette Series Gel on my hair. To go against the grain at the back I tried to hold my skin carefully as it is too loose.
I have 2 questions I hope someone can answer:
(1) In my crown area I could feel that some places there is no hair due to hair loss. There is a spot right in the middle, separated from the rest. Any tips on how to shave that?

I don't shave it too well because I usually get warning signs from my razor that the regions around without hair will get cut the next time I go over it again. The Mach 3 blade is too large for that little crown area.
(2) I was at shoppers Drug Mart yesterday and was so happy to see they have headslick. I was not afraid to smile when I saw the product. I hear all these rumours on how good it is. Has anyone tried headslick with Mach 3, and will I still be able to use my shaving brush (because I kind of like it now, the fingers don't do as good of a job)? Thanks to all.