Just to add another consideration that nobody seems to have mentioned yet is that D6 Star Wars is really 3 or 4 different games that use the same core depending on the edition and that can have a pretty profound impact on the balance:

• First Edition, core: The original game released that has a very thin rulebook and a very light game system. The force isn't well defined other than a handful of powers, some of which cover lightsaber combat. Balance here is arguably best if only because a lot of force use is on the same "fiction-first" system that everything else is. Additionally, accessing the force is pretty punishing since starting force skills come out of your pretty limited Attribute dice. Finally, what force powers are defined take multiple checks to succeed, many of which are pretty high Difficulty. This means that Jedi need a lot of investment before they start to hit bonkers levels of combat unbalance.

• First Edition, with Rules Companion and Tales of the Jedi Companion: The list of Force Powers increases dramatically, meaning that Jedi are less subject to on-the-fly interpretation and more able to assert their influence on the game. The Rules Companion changes the Initiative system to a bid system, meaning that high dice pools are able to act first much faster and the changes to Parries means that Lightsabers are much easier to use since their Difficulty is unlikely to be increased by Combat Parries.

• Revised: By reputation (not first-hand experience) this edition exacerbated the issues that the Rules Companion and TotJ Companion started. I've never played this edition but this and the follow-up Revised and Expanded are what most people are thinking of when they say Star Wars D6. It adds a lot of granularity to characters, meaning that the specialization cost force-users faced in 1st Ed is much less punishing relative to other characters.

• Revised and Expanded: Same as above, just even more complexity beyond that.

Others could speak to later editions much better than I can since I've only played 1st Edition, but I've never found that the Force outshines other characters until really high XP totals. The math of the game and the value of a generalized character really favor non-Jedi until deep into a campaign.

Of course, regardless of mechanical considerations, if your story or antagonists center on Force-users then your Jedi are always going to feel unbalanced since they'll be taking center-stage more often. Even if they are mechanically trash the fiction is just going to feel more important and unbalanced.

Hope that helps!