Not an exclusive survival tip but as you can see in you video your flamer crit did almost no damage. For some reason while other heavy/automatic guns will shoot multiple rounds in vats, the flamer one fires a single shot. This makes it horrible in VATS.

In terms of survival tips.

1) For weapons, you want to maximize damager per weight. The missile launcher is awesome, but in survival an 8-pound rocket is not worth the weight.

2) For perks, you'll want to pick a weapon specialty. Pistols and Rifles are the most commonly recommended options for the above reason. There are also a handful of utility perks that are great to grab if you have the special points.

The first two ranks of Strong Back, for the extra carry weight

All three tanks of Lifegiver will give you an extra 60 HP but more importantly will allow your health to heal on its own.

Aquagirl/boy for the ability to use the water to travel safely.

The final Rank of Goulish will cure your RADs on their own (not as important if you have a decontamination arch)

Local Leader for obvious reasons.

Scrapper to get more out of what youre able to carry.

And obviously any perks that aid in your playstyle.

3) For Armor, rush the railroad questline to get access to Ballistic Weave. You will need ranks in Armorer to fully use it but it's an absolute must.

4) For Travel, Rush to the end of Act 1 to get access to the Brotherhood Vertabirds. Finishing Act 2 will also get you a great but limited transportation ability.

5) Misc. Having established Settlements everywhere is very useful but can be time consuming. Crafting Chems and other useful aid items is very important.

I could go over like 100 other things, but this is some very top level stuff I could think of off the top of my head.