You don't need to be that close. In my younger days I used to tailgate lorries on motorways a lot, as I had a low powered bike. The "tail" of moving air behind a lorry extends for about a second of travel (I know that's "too close", but I was young and stupid). Once you get outside of that there is a small turbulent zone as the moving air from the lorry meets still air but pretty quickly you're back into still air. And having done many miles with no screens at all I've never experienced a situation where standing up made any difference to wind noise in the helmet. Maybe this is something to do with the airflow set up by your screen?

Lots of things can cause turbulence. On some other forums guys have got into this in a serious way.

Standing IS is indeed quieter if you have any sort of front cowl or small shield.
On a true "naked" bike, would be less, but still a difference sitting to standing. (I measured this with Audiophile pro equipment)

It's been found that even mirrors and bark busters can add to noise.
Who knew?

But, every bike is different and more importantly, every rider is physically different. They sit on the bike differently, are larger or smaller riders, some hunch forward, some sit bolt upright.

All this affects wind noise and buffeting.

And as mentioned, some helmets are better than others.

TIP: having done an actual helmet noise study for USA Motorcyclist magazine (I did sound recording and analysis) we "discovered" that most noise comes from under your chin.

We used a naked bike (1200 Bandit) same rider for all testing.

So ... a chin baffle can quiet things quite a bit ... if you can fit one in there.

In our testing (from early 1990's) Arai was quietest, Shuberth not for sale in USA at that time. Shoei a close 2nd. things dropped off quickly and dramatically after that.

I used "best in the world" lavaliere mics taped onto riders ears with wind screens. Test rider not happy upon removal!

I fit tall screens to all my bikes. And fit universal screens to any bikes that don't have them if I intend to travel on them.

Having a screen takes A LOT of the fatigue out of long distances. And saves your hearing too.

I have found that the top of the screen needs to be in-line with your chin to displace the air over your head.

Helmets with peaks don't help either. Although, I have a peak.

Try one of these.

https://www.ebay.co.uk/itm/232870529652

But do put something between the clamp and your screen as these cheaper ones can make your screen crack.

__________________
Did some trips.
Rode some bikes.
Fix them for a living.
Can't say anymore.

when your grandpas were riding horses would they wear windscreen ???



if hiding behind big screen why not to get into a car then

When my grandpas were riding horses, they were also dying of dysentery. You enjoy your self-image there.

I've never ridden a horse that could reach 80mph into a headwind.

__________________
Did some trips.
Rode some bikes.
Fix them for a living.
Can't say anymore.

There's a few bikes that cant do that either