Neal,
Everyone is here is visiting this site in their own free time, and have the right to offer their opinion - and equally NOT offer their opinion, on any topic.
We've had this discussion before - but you're letting your personal views/opinions get in the way, and you're turning everything that anyone says (or doesn't) into an insult towards yourself.
Very few people here have even begun to consider the possibility of aiming for as much power as you have in a VR-4 (partly, because we realise it's not the right car for it, and partly because of the cost of doing so) - so a lot of us are outside of our sphere of knowledge. The basic troubleshooting you originally asked for (which more people could help you with) is complete - and the car is the hands of a specialist, who knows way more than we do - this renders our input less and less valuable to you.
You appear to be looking for confirmation that your beliefs regarding the things done previously to your car are or are not right. WE DO NOT KNOW. We do not know what was and was not a viable option when this work was first done.
As an example - around 5 years ago, we believed that the standard ECU could not be programmed, and so people were looking at (and pointed towards) aftermarket solutions to cater for minor modifications (ie, to increase boost levels, buy an electronic boost controller). We now know that the ECU can be programmed, and we know how to do it, so we are now recommending that the standard ECU is kept for these minor modifications. The information given to a forum member 5 years ago was not incorrect - it was what we knew to be the most viable option AT THE TIME.
We do not know whether the "best" option available at the time was what was done to your car and it's only with new knowledge do we find out that this is now not the preferred option, or whether it was just done wrong at the time.
You're wanting to push the envelope with what is possible with a VR-4 - you're being a pioneer - this is not a cheap process for any vehicle - ESPECIALLY when you also have to include labour charges. You also appear to lack the basic knowledge required to understand what is required to modify and maintain a car in such a way.
If you want big power, then I would suggest you buy a car that is better suited to it and has a better tuning market available for it. An Audi RS6 Avant starts at about 400-500bhp, and I've seen ones for sale on Pistonheads with over ~700bhp.
But, even with this, you'll still be spending big money - in your position, is that really the best thing, though, as you've been complaining about cash-flow issues with the current work undertaken.
I hope that you read this post with the sincerity and respect I aimed for, and don't take it as another insult, because, honestly, I do not mean it as one. I am trying to explain why it might appear that you're not getting the support or responses you are looking for.
What might be worthwhile is getting someone to help you make a list of exactly what is what. I understand that writing is a difficult process for you - so get someone with you do the writing/typing, and you just do the talking, so you only need to concentrate on one thing - the car.
Some things to think about: What issues are still outstanding? What are your primary concerns? What do you not understand? What are your aims? Why do you not feel you're there yet?
Get your friend to type this up on here for you - they will be able to objectively write down the relevant information, without the emotion you are feeling regarding the car. This will help both you and us to understand what you require assistance with.
As I've said before, the power levels you are aiming for are interesting to me (although I do not have the funds to begin considering it), but the engineer in me wants to see what can be done, and how it's done, and see this car out on the streets and at some meets.