Go complain to the devs that they're killing the game with the stupid guard reserve.
I was planning on grinding yesterday, but after a number of attacks failed for the exact same reason (sniper meds) I went to do something else.
The only planet that I have some fun on is Tatooine. Hoth is hell (a little for both sides), forest planets are hell because defending against the atact is only possible if the enemy commander is stupid, erkit was always terrible but managed to become worse as imperials now camp/ farm there for defense wins.
Join the OuterRimRioters. Drama free, laid back, regular wars and multiple time zones coverage.
Seriously, what more can you ask for in a shitty f2p mobile game?