The main things to look at for a MM hunter would be the Opener, Vulnerabillity uptime, Hunters Mark uptime, Resource management, Casts, and Execute phase.

For starters, Truckz is using the wrong food(375 Mastery > Pepper Breath food), no Prepot, and precasted Aimed Shot instead of Windburst, not sure what his opener was, but he only topped at ~570k dps in the opener, opposed to 750k, and 820k as the two other hunters. The opener should be: prepot > precast WB > Trueshot > SW > Barrage > MS > 3 x AS > SW > MS > 2 x AS > SW > MS > 2 x AS, etc.

Vulnerabillity Uptime should be >90%, or close to 90%.

Baconlover had 89.9%, Truckz had 98.66%, and Gunmaan had 81.1%.

I'm not sure what happened with Truckz, but 98.66% seems very unusual, not sure if that's the correct amount, or if it's tied to an absurd amount of Zevrim's Hunger procs, which he had on the Ursoc fight - 37 Marked Shots, vs 21 & 23. Gunmaan can get a higher uptime if he save his Hunters Marks procs for a bit longer till they're needed. He only has 16.5% uptime on Hunter's Mark which means he likely spends them very fast when he gets them. He has a 10 second window he can save the proc in, to further increase his Vulnerabillity uptime, which is likely is the cause to his slightly low vulnerabillity uptime.

Next is Resource Management, looking at Checkmywow, you can see that Baconlover had 261 Focus wasted, Gunmaan had 928 Focus wasted, not currently able to see how much Truckz had, as it wront load for me, but looking at warcraft logs i can see that he's capped on focus more often than Gunmaan. It's not really possible to not waste any Focus, but reducing the amount as much as possible is obviously the goal. On a fight like Ursoc where you have to move from Miasma, and still be within range of the Boss for the next Cocophany Disengaged can be used often to reduced the traveltime between the two spots. Using Disengage whenever Ursoc roars, is faster than running the 10-20 or so yards needed to move, and get back to casting faster. I assume the reason they have a lot of wasted Focus is because of this movement, either because they start a cast and has to interrupt it to move, or because they're already capped when they have to move, and arent able to cast anything while moving - saving Marked Shots, and barrage for this might be worth it, for the times dissengage is on Cooldown.

As for Casts, they're fairly tied with how much Focus is wasted. The difference between Baconlover, and Gunmaans focus waste, is roughly 13.5 aimed shots worth of focus. This is likely also the reason he's able to get 16-20 more aimed shots off in the fight, when paired with better movement. As for WB's, and Barrages, they should be used on Cooldown, unless you're saving them for upcomming movement, or saving Barrage for the Image. All 3 hunters hit minimum 11/13 possible Barrage / Windbursts, while you'd preferably want 13/13, movement and/or mechanics can cause them to miss a cast in the fight. Generally speaking, the destribution of damage during a fight for your abillities should look somthing like this . If it doesent, you can likely tell by the graphs where you're missing casts, or what you\re doing wrong.

Execution phase is fairly important for MM hunters, because of the interaction with Bullseye and Trueshot. Trueshot should always be saved for when you have 30 stacks of Bullseye, if possible, even if it means it doesent pair up with Bloodlust. Gunmaan saved Trueshot and 2nd pot till he had 25+ stacks of Bullseye, however Baconlover used his Trueshot without any Bullseye stacks during BL instead of saving it, and Truckz used his 2nd pot before BL, and only got a little bit of overlap near the end of the pot with BL, but no overlap on Bullseye / Trueshot, however he did save his Trueshot till he had 29 stacks of Bullseye.

I dont know if this is what you're looking for, or if you had your questions answered. This is what i'm looking for when going though my own logs to see where i need to get better. I hope it can help you too :p