It's a difficult phase due to the longer approach shots. Time to practice and learn...
Shots depend on the trajectory of the clubs, and yours are "med/high".
The 8th of STA has two pins, one behind the bunker and one in the back. There's a wee bump before the back pin.
The front pin is difficult for everyone. You have to clear the fringe to avoid a wider hop but it won't hold close to the pin with our equipment. Only the best equipment will allow to make the ball stick there.
Sometimes you'll have to accept that there's no way to come close to the pin...
(The following is meant for #11 - my bad).
The front pin needs a slightly longer shot to clear the bunker. A good portion of backspin and the upslope will help to stay close.
The back pin is right behind the top of the green. Too short shots will roll back, those too long will end in the rough. The latter is the better miss IMHO as long as it stays close to the green.
That said, it's a good tactic to play a wee bit short but with little backspin, allowing the ball to climb the bump. This works with my "high" irons, maybe difficult with the lower R11.