Star Wars Saga - Skill vs Will

After looking over my house rules, the skills section keeps bugging me. My big problem with it is trying to reconcile the way skills are used against Will Defense, without effectively penalizing characters for everything.

The original rule for these things is fairly simple. Will Defense is 10 plus your level, plus your class bonus, plus your Wisdom modifier. At first level, that will generally come out to about 12-15, depending on your stats and class. Trained skills are at +5 to start, plus half your level, plus your stat modifier. That will usually come out to +7 if you're set up for that skill, such as a con-artist using Persuasion. Skill Focus adds another +5.

All in all, using skills that attack Will Defense is pretty much an instant win for anyone trained, because of the +5 bonus. My house rule countered that by having all skills start at -5, kinda like weapon proficiencies. The numbers evened out nicely. But I don't want to screw over the players in all aspects like that. Even trained, a good skill will probably come out to +3 or +4. That makes a fairly even chance at success for either 1st level character, attacker or defender, but kinda gimps the attacker when using that skill for anything else. What to do?

After taking some advice, I've decided to stick with the -5 penalty to skills. It equalizes regular combat and social conflict, and really doesn't make things much harder on player characters. I'm not sure exactly how to rectify the whole situation, but I don't think giving regular attacks and all Defenses a +5 bonus to match skills will help any.