Search on this site for kyleb he's Kyle Boddy president of Driveline and read his posts so you judge for yourself if he knows his stuff. Follow him on Twitter @drivelinebases, he's also got Instagram and YouTube.
Search for lankylefty on here Ben Brewster former MiLB LHP and current owner of Tread Athletics follow him on Twitter @TreadAthletics he also has YouTube
Follow @PitchingNinja on Twitter for a massive collective of clips of Pitchers throwing.
The one thing that stood out from your original post was you said
"gain credibility for coaching pitching in the future"
Don't think you aren't credible if you don't/didn't throw hard or play at a high level. There's tons of guys out there who really know their stuff and are successful Coaches and when they played they couldn't break a pane of glass no matter how hard they threw. Same with there's guys out there who were All Stars, and Cy Young winners who couldn't teach the art no matter how hard they tried.
I know you said the end goal is to be drafted, but that is highly unlikely coming out of a Canadian school let alone an OUA school, if you want to give yourself the best chance I would consider getting stateside, but with your age and your current velo that will be difficult.
Keep working I look forward to following your progress.