Of course with workouts like Geiger you can push more power but then, like you said, it is a different workout. To be honest PR on workouts are comming naturally but do not change nature of the workout. If you want you can shorten the breaks between intervals - this change should be enough. Of course with workouts like 30s/30s you can go as hard as you can 
With sweet-spot workouts - change the rest between intervals or find a workout with longer intervals - but stay in SS zone. Of course if it at the end of your training block, and you feel big gain in FTP you can push a little harder (but this I would try on threshold workouts - not SS. With SS go for longer with shorter brakes).
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