Trust me when I say that you should move to a HSTR guild. I waited too long to leave my original guild hoping people would work on the the proper teams. We would only score in the low 30*'s in TB and would usually get killed in the last few hours of TW due to lack of participation. Our guild leader was MIA most of the time. I had to implement rules about non-participation and had to be the one to drop the hammer on people. It was tedious. As soon as I joined my current guild, I had my first Traya shards within two days. We just got 45* on the LS TB and are hitting 47* on DS TB. TW is always a toss up due to being in a high GP guild, but we are now generally clearing the board. We did this last time but lost by 50 points or so, but overall, it is a better record than my old guild and I am in the top reward bracket.
Unfortunately, trying to hold to your old guild will just hold you back. I'm about 7 raids away from finishing Traya finally. The HSTR gear alone has helped me immensely. Even without DR and DM, I can still hit top 50 in my arena, which is on a near launch day shard, and this is as a ftp. I manged to get 6* Padme the first time though, which most likely would not have happened if I were still in my old guild. I should also be set for DR and DM when they return assuming it is at the end of June. That also probably would not have been possible without switching guilds.