I would onyl wear them if the horse needs a little extra encouragement. You said he was dead-sided, so yes I would consider using them. But seriously, use them properly. Don't be one of those idiots who tears up their horses sides because they jab
the spurrs instead of rolling
I've onyl had to use spurs on my Appendix mare, Annie. And boy, as soon as I did she was all "Yes, mom" and "Whatever you say, mom."