I'm sure their fine bro. I don't have a lot of experience growing Sativa dom's.
My RBC has white pistils everywhere still 2 days and it will be in flower for a month.
I'll be able to let you know if it seems normal by the time you harvest lol which doesn't help much. Each plant is different though and your's look very healthy so I wouldn't worry about it much bro. I was just looking at the LA's and their branches are starting to sag from the weight
I'm going to start flushing tomorrow, Hopefully be chopping in 10-12 days or less.