Sounds like your transmission was on it's way out and changing the fluid wasn't the fix. The only fix at this point is a rebuild or used.. But also as people have mentioned, checking shift cable adjustment and bushing wear in the cable ends.
Having support that you can actually talk to is a major thing these days. It's horrible when you've gotta go through all these prompts and still can't get someone on the phone. When I was dealing with KAAZ and K-sport back in the day, they both had great customer service.
I assume you are using Versatuner to do your logging. Do you have a log from this tune? What's your average Baro reading? Are you using a stock size MAF housing with the JBR inlet pipe? Cone filter on it? How is your Grimspeed boost controller plumed? Is it for interrupt mode, or like the stock...
I'd be interested in seeing your tune.. I've got a thread about my Speed6. I've slowly been diving more into my tuning strategy.. It sounds like you don't fully understand how all the tables work together and whats in play and when..
Your opinion on what you are feeling is going to be different than mine if I hopped into your car and gave you advice. Since this is a it "feels" not ok, but it's not flat out broken. No one can answer that question for you.
If fluid changes that are recommended haven't fixed or improved the...
What does the guy tuning the car say about the problem?? 9 time out of 10 people come asking for information on what they think is the problem, but they haven't talked to guy doing the tuning..
When it comes to logs, you need Actual EQ (Or AFR), Desired EQ (or AFR), MAF g/s, Map, Short term...
Another notable tip..
When you have a trouble code. Check freeze frame data. Any generic cheap OBD code reader can access it. That data will tell you at what RPM and Engine temp the code was set plus some other useful data if you know how to understand the pids you are seeing. This would tell...
Those problems are likely the cause of the failure. When you see stuff that that indicates installation problems you can't blame the part at that point.. Doesn't matter what it's reputation is.
a leak down test is your best friend for telling what kinda health the engine is in. (Compression tests don't show everything)
If you are worried about the ECU stuff, contact who ever you are going to use for tuning in the future and ask them about it.. Otherwsie, With a small paid...
When it comes to the rust on the plugs.. I wouldn't be to worried about that... I've seen water creep down into the plugs through the inter cooler ducting during some big rain storms and lots of hwy driving.. It's not something to worry about being a major problem... Replace the plugs and...