Boosting energy levels

[Sparkly]

Anyone tried any good products/ feed for hotting up a lovely but way too laidback horse?
He is a 6yr old 17.3 ISH who has a wonderful temperament and tries everything that is asked but lacks "sparkle" and energy in the dressage ring. I am exhausted just after 1 test from trying to keep him moving!
He is on competition mix and oats which have had a bit of an effect but wonder if anyone has experience with anything else?

 

[Sparkles]

Top spec turbo and tiger oats worked treats on our lad...we gave the turbo as when we needed it for an extra, rather than as a normal part of his feed. The tiger oats were in everyday but we did have to soak/mash them slightly to get him to eat the quantity he had as he was quite fussy with them in. Tiger oats, if I remember correctly, are about 3 x's stronger in energy than normal oats, if that helps.