I got Enemy within working sideloading it and using GLtools to imitate a mali GPU. I used this guidehttps://forums.geforce.com/default/topic/791979/xcom-enemy-within-how-to-get-it-working-on-nvidia-shield-tablet/
Same problem here, with energy setting at "performance and battery fully loaded I top at 26K, earlier ROMS always > 30K
Edit: A reboot solved the problem. Now sweet scores around 35K :)