Well, first of all I'll explain details of that occurrence for everybody. That was 01/06/2003, 2nd lift on our DZ (1st for me). I was the LAST skydiver who left chopper, so after headdown training (I don't really stable in headdown and sometime horizontal zooming takes place in my individual jumps) and deploy at ~2500ft I was pretty far from landing area. So when I passed landing point and made 180 deg. turn the really altitude was less than 200ft. But a lot of VERY white snow and VERY bright sunshine played a very bad trick on me, so I understood my mistake only after completion of my 1st flat 180 degree turn under Crossfire. I cant even imagine, how many meters of altitude will eat Crossire after it. So in a split second I found myself digged under tons of beautiful soft snow.
So main reason of that occurrence was:
my lack of experience in low-altitude flat turns with Crossfire;
my stupidity in case of unusual weather.
After that terrible landing I have had long conversations with ALL instructors and many experienced jumpers from our DZ, most of them saw that fall themselves. I have completely became aware of my mistake and I think I will not be so stupid again. As my instructor (Roman Lednev) said, sometime everybody, even REALLY careful jumper, can made same mistake, and I'm very lucky, because I passed this test in right time - with a lot of snow. And, as he said, downsizing and canopy model are not reasons in this case. The reason is my brain. I could get hurt by low-altitude turn with my old Omega-149 @1.3, or one of many "right" (for my experience) canopies.
So, as direction of DZ decide:
I'm not restricted to jump my canopy for the time present;
I must use not more than 90 degrees turns for speed it up, always pay attention to altitude.
After that occurrence I've made 15 jumps for now. All my landings was controlled by instructors. Most of landings was straight line, sometimes it was 90 degrees. Every jump I've remembered that stupid landing. Every landing was perfect, so my instructor said he believes I'll not repeat that mistake and I'm really adequate enough to fly and improve my skills with my current canopy.