As a die hard TuanHA supporter i would like to say his CR but with the lack of attention to boomie for PvE i would go with stars. Thats just my opinion though, someone out there might have more experience with editing and optimizing the CR's to increase performance. the only problem i have had with stars is that it would sometimes pull mobs not in combat with starfall, which sucks because you have to turn off the AOE and if you are in a fight that requires aoe your dps suffers greatly.
you can evade starfall pulling the whole instance or mobs you dont want if you glyph it mate its called glyph of the guided stars i think...uggla is also a very nice cr to use with boomkin on pve try it out
yes. good point. Glyph is called "Glyph of Guided Stars" as mentioned , which is (almost) necessary in pve, else you aggro everything. however, in pvp it doesnt really matter.
nothing out beats GS Druid from Cokx and Tozi, the dmg is unreal as is the pvp coding they have implemented. For pve, go with one of the others probably.