I always think that SG is not as per Snatch (an ex-SG player) as a game of an orgy of non maxed random units before EG and a sysmatic vomit of EG units during EG.
now I am not saying you should not use max EG units EG, I only want to share some of my experience of the game.
1. block the ramps/bridges (don't blcok allies !!)
so many times I have see GGP and penderr (aside from the fact that they are not always nice to ppl) delay enemy poccing for a long time with "shit units" like ubik and peg, now if the proper units the effect will be larger
2. the unusual use of speedy units
a) to block enemy's path, most ppl just right click where they want to go and don't pay attnetion while the units are moving. By simply place your units in front of the enemy (shoot in the same time if you can) it will make the squard Shattered, making them easier to kill by you and by your ally.
b) last poc to win, already past EG time, our ally on the last poc, rein you AA or you speedy unit, put on boost and run to poc. Better then your max abom whcih will never make it on time to the poc before the game ends.
Think if we only have one last poc, what units will we rein, I say pigs, vults, arbs and maybe ghasts therefore:
3. the position of nix during poc time, especially for last poc
nix should always sit VERY CLOSE TO POC, only if the poc is being balled
a) most ppl already noticed about 50% of the time the "nix bug" will send the nix to corner if you click a enemy that is far away
b) nix is slow even with best ab, they can't chase clouter pigs well and can never catch pigs with good ab, so stay close to poc, let the pigs come to you. I have see too many ppl go to portal and miss the pigs then try to catch them "slowly" while the sitter suffers unnecessary dmg, needless to mention vult ranges are short so no need to run around and miss other enemy ag coming from other direction
4. the position of other AA during poc time, especially for last poc
They should be next to portal to hunt vult and pigs because they have the speed and they can't kill as fast as nix, no need to explain the logic i guess
5. the position of ground units during poc time, especially for last poc
when you see there are enough poccers (one set of solid poccer like wraith, abom, quorg, levi, moths) on poc, go to the portal and hunt arbs, don't just get on too.