That's also wrong. Omega's stats only depend on his level, and his level is permanently set to 100 in the Playstation version. At least in the PAL version of the game.
This game is sadly the easiest out of all the FFs if you ask me. I love the idea of the junctioning system... but it's so easy to abuse. Or rather... it's so hard NOT to abuse, unless you set up certain rules and restrictions for yourself.
For example, like this:
YouTube - Waka Weapon part 1
The only time I remember having a really hard time was when I played my "Ability junctioning only" challenge several years ago. That made a few battles really, really tough.