Amazing! I always thought the satchel charge area was too high to jump to from the swamp! As for the Plasma Rifle, hell yeah you should skip it. It's only a little better at sniping than the Tek Bow and damn near useless as a combat weapon. Also I thought up a time saver for the Hive but I'm not sure if it would work since I've never tried it; If youcan respawn from a save point instead of the nearest teleporter then you could have a really easy victory at the main force field generator. Simply open the second save point of the level, hop in and leave. Next fight your way up to the main generator and destroy it. Instead of fighting the green Mantids that appear just keep blasting the generators and when you're done either jump off the cliff or let them finish you off(depending on how much health you have after destroying it. Of course, this is presuming that the save point will be your respawn point too... Also, about the Queen Embryos; You can actually snipe them with the firestorm cannon from just outside the tunnel leading into their chamber, though you won't be allowed to see what you're hitting. After enough damage you will still see the slime from when you destroy her cocoon. After that I've devised an amazingly efficient way to finish the Embryo on the ground- Stay right where you are, crouch and use the Shredder with green shells. Most of the time the shrapnel gets stuck under the Embryo so that it deals hellish damage, taking only between 3 and 5 shots to finish the thing off. The green shell shredder also does great against the first part of the Queen boss, getting stuck between her little claws and finishing the round in 2-4 shots when done correctly. As for the master computer, you only need to take out the first 2 ceiling guns, you can hug the computer and use the four smaller computers as cover while you circle and plant the charges. Also, about the energy totem fight; You can arm the War Blade and head right immediately after you teleport in to get the drop on one of the green Mantids as it comes in. Just use the Head hunter and literally just wait in front of his spawn point, and chop his head as he warps in- rinse, lather, repeat. This means that you save all your ammo and most or all of your health, and best of all you'll be looking at a wall the whole time so you don't have to deal with the ridiculous lag from all those other enemies attacking the totem.
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