Christian Thibadeau recommends sprints and prowler pushes superset with 100 lb glute bridges or hip thrusts. I've started doing more higher rep hip thrusts and kettlebell swings which has helped. Bret Contreras has article on ways to hit butt including sprint, bulgarian split squat, back extensions (with knees bent), reverse hyperextensions (I like these high rep 25-50 at end of workout), high step up, sumo deadlift, front foot elevated lunge, hip thrusts and glute bridge to be the best.
women need longer interval training to get blood flow in legs, so aim for 90 sec-2 minute conditioning versus tabata type protocols.
also, that hard to reach area requires full ROM on all exercises. So I do mobility exercises and glute bridges at beginning of all my workouts and can feel my whole backside working in deadlifts and SL deadlifts and never in my lower back anymore - Joe DeFranco has limber 11 or Eric Cressey has some good videos too. also make sure you tuck your chin and keep head neutral when doing deadlifts and exercises - if you keep your body in straight line you'll feel it so much more, as well as squeezing your heels together and into the floor for tension. Hope that helps