So, I've changed a few details: I've let out the back at the waist a bit, somewhere around 1/8" to 1/4" and I also corrected a minor glitch in the back hem, it's parallel now. I also corrected the right sleeve and gave it an extra inch, now it's the correct length, I suppose.
Now, this might actually surprise you, but I am still not 100% happy with the results so far... I still see some folds in the back, around the upper arms - they have to go. The rest: Arms, front: I'm OK with that. Rory wrote in our forum that it'll take you 3 coats to get it all right ... so, there'll be enough fodder for this blog for years to come!