The Great White North, where we get taxed out the wazoo
Are you using the powder Training Day or the tube stuff? I use the powder for my TB and follow the 2 scoops 2X day for 2-3 days before the event. I'd go with a bit smaller amount per feed but not too much. You kind of have to do a trial and error at first with it to get a feel for how your horse will react. Everyone I know who has tried it for showing on has used the full amounts but they are all horses, but all have been pleased with the results.