Good teams for Sion?

So i don't have Thrawn (i was and still am way to lazy to invest in the Phoenix kids).I use Palp lead,Vader (not so fast),Nihilus (not so fast as well),Tarkin (216 speed with both zetas on him) and Shore.I do swap Tarkin and Shore with GK and Sion (almost at G10 and 203 speed).If i put in,let's say Sith Trooper and Sion,my team has zero chances against CLS and JTR.If i use GK instead of ST this team manages somehow to defeat CLS lead teams and some JTR ones.I really want to keep Sion on this team but i don't know that tank could make this team not fall apart in under a minute.Sith Trooper is only at 4 stars but G10,Shore is halfway to 7 stars and G11,GK is halfway to 6 stars and G11.Like i said before,the fact that Sith Trooper is at G10 doesn't help this team at all.So i still can't figure it out how ST can be called a "nightmare toon in a nightmare team" since GK is way over him.