That's not heavy at all for galloping. Even with all the experience you have, still listen to people that have been galloping for awhile. Riding jumpers compared to racehorses is a totally different ball game. One of the main things in learning to gallop a racehorse is how to throw a cross.
Excercise riders dont throw crosses , jockeys do. Exercise riders are paid to pull not push.
__________________
Horses are like strawberries....they can go bad overnight. Charlie Whittingham