HORSE FEED HELP!!! Supplement pellets aren't available anymore :(?

My horse feed store stopped supplying a pellet supplement that i have used for a while and LOVED ... it was the best one i have ever used http://www.prognutrition.com/padietbalancer.html , I have used life design mare and foul, john lyons senior, purina senior and nothing has come close to this. My feed store carries a lot of purina and strategy and was wondering what i should go with. I would prefer to go with something that is the same because all 4 of my horses are in the pasture together when they get fed pellets in the morning and if they happen to change buckets i dont want it to be a big deal. I have heard about the healthy edge purina strategy ??? is this good ? I have 4 horses. ages 3 - 20 . The 20 year old was an abused malnutritioned horse who we have struggled to keep on weight on her for 4 years. the progressive adult supplement was the only thing that we have seen a difference in her weight. unfortunately we cant get it anymore :( Is there anything you know of that is close to this supplement. I need something for all 4 that is the same .... so senior feed wont work until winter time when i put them in their stalls for the morning.