Hi Danny, I am an Industrial Sewing Machine Technician and can put some light on your situation through experience with Adler 205 and general Industrial Leather Walking Foot Machines. Firstly, the spec of a maximum 10mm Stitch length is correct and in theory should back stitch (reverse) into the stitch holes. Some fine tuning may be required by adjusting the position of the Upper & Lower Slider Plates in the reverse lever guide plate. It can sometimes be difficult to get this adjustment correct but your Adler agent should have the necessary skills or be able to obtain technical assistance from DurkoppAdler in Germany to help with this problem. With regard to the feeding problem, "The needle and the feed-dog move forward as the presser foot rises", this is caused by the Walking Foot Assembly being out of adjustment/sync. The feed dog height on your model is not adjustable but is adjustable forward and aft....the stitch length should be set to maximum and then turn the machine over by hand and check to see if there is equal clearance in the throatplate forward and back. Needle breakage is definitely related to incorrect feed/foot timing and also hook timing/needle clearance. I would help you more if I was in Canada but am located in New Zealand. My advise would be to ask the suppliers to agree to allow you to get an independent technician to go over your machine and reset the timings etc. Good luck!