[CrapShoot]

Well it's an interpretation really. Most players that I play with use com_maxfps 125 or one of the magic numbers because its what we play against online. People have been using those since a little after Quake 3 came out. And online play is much different than the SP version.

pmove_fixed from what I understand simulates 125 fps for the host on a non-dedicated server no matter what your current fps is.

It's the taller boxes that are difficult to jump on if you dont have the right fps. Like the ones in the allied garage on mp_assault.

I suppose that you could up the gravity on your server so they don't jump as high, but that may cause some adverse effects as well (i.e. fall damage, slower movement if you jump while running, etc). The command is g_gravity. Default is 800. So you may want to experiment by upping it by 50 each time until you find a number that you like.

For the server lag you may try setting your sv_maxrate a bit lower (if you haven't already). The default is 25000, but you can have a decently smooth game with as low as 5000. 130kbps upload should be able to handle a single client connecting at sv_maxrate 10000 without any problems.