Gmax Envelope editing problem

I just figured out how to get my models working *celebrates* and I was wondering, when you are editing the envelope (i use gmax) does it do that horrible jump to you? I grab one of the outlines for it move it slightly in any direction and it pops open realllllllly wide...... is there a way to fix this? like slow the mouse speed or something. Oh and also once its open wide, most the time you cant close it partially to get it to the right size

that happens sometimes im not sure why either.....i have had more luck moving the envelopes along the y-axis i believe....some of the other axis dont work right for me.

don't use envelops, use weight table to have perfect balance and assign the vertexes by your own.