1st-level PCs in 3.5 were ALREADY pretty tough compared to the warriors and commoners around them. Max HP, elite ability score array, better equipment, and better classes. These make a HUGE difference. A 1st-level fighter with 12 hp can withstand two ordinary hits from a longsword, or three shortbow arrows, and keep fighting. He can take any non-critical hit from a raging orc barbarian's greataxe (1d12+9 or so) and still live.
If that's still not enough, then what I would do would be to weaken the commoner back to the 1-hp "Normal Man" in the Basic/Expert set that I started on. Because if you give the 1st-level fighter 30+ hp as in Saga Edition, what do you give your basic ogre?