Aluminum reacts a lot differently than steel wire does. The Tip to work distance can be increased dramatically without having voltage/amperage problems since this doesn't preheat the wire as much as with steel . There are a couple of reasons that aluminum will burn back. the obvious ones are not enough wire (speed to low) or too much voltage (heat to much). these are easy to fix, by obviously an adjustment. The other reasons for burnbacks, is that the heat required to weld aluminum is much more than that of steel, and this causes the tip to contract around the wire, creating resistance and with aluminum being a soft product, makes it harder to push. I think the easiest way to solve your problem, is move a little further from your workpiece, and adjust your wire feed and voltage.
hope it helps.
Hey Alumatuna, when are you getting the burn back? If it's when you first start your arc try a little striking motion as if you were stick welding. If it's as your welding see sparx post. Don't expect to get good perforamce out of the last 1/3 of the spool, the wire is spooled at such small diameter that it starts acting up with worse feeding performance then what you had to start with. Also check the wire as it comes out of the spool without letting it contact the feed rolls. If it is wavey try another brand of wire. And try a longer arc length.When I buy 1 lb spools I always figure 2 tips per spool. Sometimes they can be salvaged.
Get yourself a set of those tip cleaner drill bits that come as a pin vice. I use those and also keep a .056 reamer in it when doing .047 wire. You may want to try using .045 tips for your .035 wire. I recently finished a D17.1 job (pre Aerowave) with 4043, .047 at 25.6 volts and could only get about 15" of weld before I had to change tips (upper limit of electrode). Stopping as soon as you see a feed problem helps in salvaging tips. Don't wait until it burns back and melts the tip.
Hope this helps and you have my condolences for having to weld with 5356- Ted