outdoor HSS Av or M?

Usually at indoor flash, I put in M mode and ETTL, put meter between -1 and 0, then let the flash take care of the exposure.

However, on HSS at outdoor shoot, should I just use Av mode? I do take a lot of event so I just put in 2.8 in Av with ETTL HSS.

Is it normal? How do you guys shoot?

Also, for direct fill in flash, do you guys adjust -1 on flash?

If I'm doing an actual photo shoot, then I have everything in manual.

It really all depends on the type of shot you want to get.
If you want just a tad bit of fill in flash then 0 FEC for Av and -1 for flash would work.
You want 0 for FEC because camera automatically decreases cameras exposure compensation by -1 as soon as you attach a flash to it. In Av all else being equal with flash the camera would meter 1/200 shutter whereas without flash it would meter 1/100.
Put FEC for flash to -1 to make the flash very subtle.

This said, you have to keep an eye on the look you want to get and always adjust flash and camera exposure compensation as needed.
If your distance to subject and framing always changes, then Av and ETTL are mch better then manual. They give you a baseline good exposure, and you can do final adjustments from there with camera and flash exposure compensation. Faster workflow.

Indoors, M for camera is the way to go to control ambient. ETTL for flash.
One indoor tip I would give you is to use an ISO of around of 800, not only it will make handholding camera easier due to faster shutter speeds and increase the ambient contribution, but will also make flash recycling much faster and the flash last much longer. Considering how clean ISO 800 is, consider it a "free energy".

Cam to Av, ap to 2.8, ETTL (flash algorithm to either Eval or Av) and with HSS enabled - is one place to start.

Given that you have to watch exactly what the system is choosing, when set as above, you could say that setting everything yourself in M is nearly as easy.

In bright ambient, your settings are likely to invoke HSS most of the time. So your Speedlite & especially its batteries are working roughly X5 harder than when in normal sync mode.

Modest neg FEC is fair enough as a starting point. Cheers