I don't know is it mistake or what, but in the 100% route by Caster in the Act 2, after Loan Shark dupe for whatever reason we go to a second island and do balloons 50,65,67,73.
Can somebody explain this?

Hello, I'm glad you are showing interest in the category but first of all, no need to make a separate copy of the route without waiting for any answers. I assume you were confused, that's why you did it. No problem with that, but ask others (either wait for a post here or write in Discord) before doing something unnecessary.

I'll reflect to the changes you listed under the submitted guide.
1) Indeed, the balloons don't make any sense for that split. I asked Caster to work on this.
2) You are supposed to take the fixed Sanchez from the trailer park AFTER completing the part of the mission at Phil's old apartment.
3) You are supposed to grab the shotgun on the way to Phil's old apartment. "We have to do Boomshine Blowout before Marty's first mission so we don't approach Marty from South with the shotgun on the way." -Caster.
Wheter this is slower or not is a different question. Have you timed them?
4) I assume this was leftover information from an older version of the route. Fair point.
5) Self explanatory.
6) Good addition but this alone does not justify branching the route into a separate document (this makes it more difficult for people to find the right document). You could have just asked us to link the video.

Sorry for the late reply
I dont understand 2 part
You can just do USJ 1 and then go to airport and do 13. Then we just drive with the car at front of Phill's place to the end marker
3)So maybe it's actually faster to grab shotgun early, but i can't properly time it
My results were:
Early
9:26
Late
9:31
But there were large mistakes
I did'nt do Shoting Range
I am gonna delete the document, but please add some changes that i made

Hello again.

2) You do USJ #1 with the Streetfighter on the way to Phil's place. You progress with the mission as you normally would until you part where you obtain the money from Phil's apartment. After that you take the fixed Sanchez from the trailer park and do USJ #13 inside the airport on the way back to the army base.

Your suggestions for fixing the balloons and adding the video about the Paramedic strat are noted.

I found another thing that Caster can change, on The Bum Deal we need to kill Lance to store Wintergreen, but we can just store Wintergreen and continue mission like normal.

Nice find!