The most vulnerable piece of equipment is the filter. But with that filter, you don't have anything to worry about since max flow rate is 150 GPM and the EcoStar will never reach that let alone the APSP flow rate of 120 GPM.

Also, the flow rate recommendations for PVC pipes are mainly for water hammer. You can exceed that without much worry about any damage. So you can technically run as high as you want although I would keep the filter pressure below 25 PSI.

Also, how many spa jets do you have and do you know what size? (e.g. 3/8" or 7/16")

Is the spa on 2" pipe as well?