I have a Belgian dubbel in secondary now. I racked after a week in primary. The OG was 1.07 and I racked at 1.02. There is no activity in secondary for a week and the gravity is right under 1.02. I know your not supposed to see much,if any, activity in secondary but I feel I should be able to get it a little lower. I have more yeast (wlp500 trappist) for bottling and was considering pitching a little more too see if it will drop.
--Your yeast attenuation is 75%, you hit around 72% which is probably fine (depending on your recipe and if/how you mashed).
--If the reading hasn't moved in several days I'd say it's done--no need to repitch.
--You generally should wait to rack to secondary after your ferment has finished--There really shouldn't be any fermenting taking place outside of primary.