Tigg-Ted,
You are right, this subject has many variations (and has been done to death) and the conclusions are always the same:
Until you make a screen high and wide enough to take the buffeting over your head, you are throwing your money away.
If a screen costs £45 what do you think the result is going to be ??
The MRA Vario costs £100 and doesn't work !!
I'm sure you've read the posts on here about screens and there is one definite proven screen out of all of them, and you have to make it yourself:
I don't want to come across as harsh but I hate to see people throwing their money away. I was in the same dilema as you and tried four different screens and they were all a waste of money, so I got off my arse and solved the problem for myself. A OEM Triumph Tall Screen with Vario hinges and a home made spoiler high and wide enough to deflect the air flow over my helmet. It works 100%.
I didn't get there in one go, I had to test many variations and designs, but the rewards were worth it. My buffeting was so bad that I was getting off the bike feeling physically sick. Now all I have is still calm air to sit behind. The difference is amazing.
I get PM's from people on here and TigerTriple all the time asking how I made it and does it really work, and yes it does - 100%. They are in the process of making their own.
How much testing do you think these screen manufacturer's put into their product ??
Do you think that they design a screen and put it on a Tiger and make sure they work, ?? NO.
Do you think they test them again and again until they do work ?? NO, they are purely cosmetic.
I know this sounds like it's turned into a rant, and it isn't aimed at anyone, but the solution is already out there - you just have to make it yourself !