Forgot all about the alfalfa, shame on me
Alfalfa, hay or pellets, has around 1100 calories,Purina Senior 1200( like most senior feeds, it has lots of roughage, because it's meant to be feed to horses with few teeth, which obviously cannot chew hay well. If you check the amount to feed, 12-15 lbs, it tells you right there why it has not much effect). The Healthy Edge has 1300, the normal Strategy 1500.
So, feeding alfalfa, together with a few lbs of " normal" feed should show results.
If you could get Nutrena, their Life Design line has worked well for me.