yesterday I had the sealing sleeve and leaking trans pan replaced. Replaced fluid with Redline D4 and all of my surging issues are gone. Total cost for the work was $735. My symptoms prior to the change were hard 2-1 downshifts and a noticeable surge when shifting from Reverse to Drive. I should also add that no software updates were done as my mechanic said that all software was up to date. I'll report back in a few weeks as to whether or not this resolves my trans issues long term.
2005 545i Black Sapphire Metallic - Sport/Premium/Cold Weather
2007 328xi coupe/Auto/sport/premium/black saph/saddle-turned in Aug. 2010
1983 Porsche 944/5sp/Gemini Gray