So just because you can't beat it every day, you want it's difficulty lowered?
Believe me I was in the same spot roughly six months ago. I was level 85, I could not beat GW whatever I tried, so desperate I wanted to get those 150 wins to be able to sim. I have even complained about it on the forums.
Then I changed my approach to it ... and I think that is the thing you need to do too. You are just lvl 68, you have time to learn and play. Make more then one squad. Your argument that you want to focus on a select squad to provide more to the guild is rather invalid as at a lower level you'll be able to do less in raids, TW and TB etc. Develop your roster further.
Once I changed my approach, came up with multiple squads and never used the same squad in the next battle, GW was easy to finish each day.
And before you say, sure but you were level 85. I took the same approach on my alt account, started Galactic War at level 40, developed Phoenix Squad (you should farm that rightaway, as it gives you access to two toons that still are a few of the best characters in game), an Empire Squad, and working on a Bounty Hunter and Jedi Squad along the way. Never lost a Galactic War since, even when facing opponents that were 10 levels higher then me.
And before you think oh he spent a lot of money on it, my alt account is completely free to play.
It's easy and doable if you take the right approach!
Good luck!