I have the same score, I have applied for EOR. In my previous attempt, I scored 8.5 in writing (I knew that I messed up in reading and scored 6.5); therefore I could not believe that I scored 6.5 in this attempt, when I have 8.5 in both listening and reading and 7.5 in speaking. Though, I was not hoping for 8.5 but I hoped for at least 7.0.
In my opinion, if money is not a huge issue for you and if you have scored 7.0+ in your previous attempts (if any) OR if you have any teacher who evaluated your IELTS writing and gave you 7.0+, I would recommend you that you should go for it. As rafal mentioned in one of the above posts, almost everyone is getting 0.5 increase these days.
Also, if you think that you wrote essay and letter (especially essay) in the IELTS format, with relevant examples, over word counts and correct conclusion. You should go for it.
Also, I have gone through almost every page of this forum and realized that out of 10 people, 6-7 people got their band increased.
Good Luck!