Scott..
I'm not really familar with the Montana..have flown the 5m version once and it seemed like a pretty easy and stable kite overall. Leebrianh may be
able to help you more with the adjustment stuff as he has one as well. If he doesn't chime in you should send him a u2u or email.
The only things I can suggest is try cleaner winds free of some obstructions and consistant winds as well. Flying that big of a kite in dirty winds
will do like you're saying, collapse and then grab you suddenly. Not a good scenerio. Best bet is that if it balls up, fully depower the kite or let
the kite killers do their work. If you feel a gust coming depower it then as well..that way it won't shoot up and lift you suddenly. My crossfire
did similar things in dirty winds, but in consistant winds it's SWEET! I noticed the overflying bit as well, and I think that tends to happen quite
often on my crossfire when there just isn't enough wind to really be out and about. It tends to want to fly past me to grab winds, then balls up.
As for your boarding.. you should definitely practice the kite control off the board first, then add the board. By this I mean sending the kite from
the 12 o'clock position down to the 3 o'clock position while walking or running in the direction that you're sending the kite to impersonate riding a
board. You have to continue sending the kite back and forth to continue momentum.
You don't have to use the 12 to 3 all the time though. For instance on a high wind day you'll probably go from 12 to 2 or even 1, then back up to 12
and back down again. On low wind days you may have to send the kite further down past 3..like 4 or close to 5 to build up and keep momentum going.
So yes, you have to work the kite continuously to keep moving. Like I said earlier..in high wind conditions it's less working the kite because you're
not making as large of power strokes going from 12-2 or so. In lower winds you've really gotta keep at it though.
When you add the board to the combination, start off by putting the kite into the neutral zone and then step into the board (make sure the board is
angled about 30-45 degrees off the direction of the wind). If you head directly into the wind you're going to end up overflying the kite or out
running the kite eventually loosing momentum and causing the kite to collapse. If you angle the board at a 90 from the wind you're likely to get
yanked off the board or fall on your face once you start (trust me, I know from experience). I typically start off aimed more towards down wind then
not, just to start off and then almost immediately end up riding the wind like you do sailing..across it almost at a 90.
A good example of what I'm talking about can be seen at this site...
http://www.kiteatb.co.uk/basics/starting_to_board
Hope this helps some and sorry I couldn't help with the adjustment stuff.
~Joe