My oldest and I have been playing for a long time, we can sim GW no problem Everything's cool for us.
However, My youngest just started playing. This is the first day she could access GW. She plays her first day pretty smart - coached by me - and loses not a single one of her total roster of 13 characters.
Node 12 has 12,500 GP. If you just put her strongest 5 toons in they're 8500 GP ... that's almost 1/2 again as much. Not only that, but she has only those toons that you're able to access easiest on the way to level 40, mostly the ones that have been giving to her. The node 12 she had to face was Tarkin (L), T3-M4, and Cassian, in addition to the two common toons for those levels Talia & Farmboy.
+45% would be too much even if the Node 12 didn't have rare toons like T3-M4 or well-synchronized toons like Tarkin & Cassian who play off each other's debuff abilities.
This node 12 is impossible under anyone's strategy. I've said it before, and I'll say it again, it's fine to make it tough enough that you have to use your toons very carefully, monitor cool downs, sacrifice a certain number of toons at need.
Making node 9 or 11 or 12 impossible is bad game design. You can't expect any level 40 player to beat that squad that has in just those 5 toons 60% of the GP of the player's entire roster.
Bad. Game. Design.