When push comes to shove, there isn't a feed or ration balance out there that is worth a pinch of you-know-what, where metabolic horses are concerned.
UNLESS you can easily get McCauley's M-10 ration balancer or EquiPride in the bag, not the lick tub.
Except for the two I mentioned, Everyone uses soy as their protein source and a lot of laminitic horses can't tolerate soy. Annnnd unless the grains in the feeds and ration balancers has had the sugars removed (like when whiskey distillers remove it, then sell off the dried grain), the feed still has high starch and sugars.
I am sorry I can't remember, is Trouble an easy keeper? If he is, you could order what I have been using for both my IR horse and the easy keeper for 2-1/2 years. It is a condensed vit/min supplement that only requires the horse eat three ounces daily. I mix it with the other supplements in Standlee brand Timothy pellets and water. It has a guaranteed maximum NSC value of 4.25%
. That cannot be found in any bag of feed or ration balancer. It does not use soy as its protein source and there is no added iron. https://horsetech.com/high-point-grass
You want to be sure to buy the supplement for grass fed horses.
Here is another piece of IR trivia that isn't proven but I can attest to with my IR horse: There are a few insulin resistant-prone horses that APPEAR to be flax intolerant. I know of two, one of which is Joker. I have taken Joker on/off Omega-3 Horseshine three times because his hooves got warm. It could be coincidence but three times? Flax is supposed to be good for IR horses but it does seem that isn't the case for a few of them.
At the vet's recommendation, I put Joker on Nanric's Extra Strength Biotin 100. I'm not sure how much it helps because even at his worst founder point, Joker still had stronger/thicker hooves and soles than some healthy horses.
Anyway, if you can manage the Horse Tech, try a 15 lb bag first. I use the meal form, both horses eat it without issue. I think I figured it to cost about 70 cents per horse per day.