I just wrote this email to someone about tamandua diet and think it could be helpful here too.
(asked how I came up with the diet)
Science and a lot of work, mostly math. I started with the study that listed the nutritional analysis of the stomach contents of wild tamandua. I then combined ingredients on paper and added up their nutritional analysis till I got something closely matching. There is also another study documenting how detrimental too much retinol and calcium is in their diet, feeding the insectivore diet is actually unhealthy in the long run because of this. Spinal changes happen in as little as a month when getting too much retinol and the calcium to phos level being to high makes it worse. You wont see mobility problems at just a month but years down the line you may have to let them go early because of the spine fusing together. My diet is within the safe levels recommended by that study on both. Pua's blood levels that I had tested during a check up also match with healthy levels found in the study.
The beef diet has proven to be very healthy. Many a tamandua who had issues like going on and off food, up and down in weight and things like that have turned around once on it. A friend who has many tamandua never had a baby till she started using the beef diet, then she was having too many babies. They are capable of getting pregnant again very shortly after birth. So she had to start separating mothers to give them breaks.
Are you giving anything for vitamin K? Most people who use kibble use it mixed with leafeater biscuits for the K and extra fiber but you only mentioned the one. The natural K(in the beef diet from thyme or spinach) seems to be superior to getting it in supplement form.
I like the silkworm best because they are very nutritionally similar to ants. Adding them to the diet does not change the values at all because it's already at basically perfect values. Another great feeder if you have the space is feeder cockroaches. Roaches are so closely related to termites that they are really just different species of termites. There are even wood roaches that eat wood like termites. Pua loves roaches. Most you can buy will be pretty big for their little mouths so you may need to grind them up but they are great food. The thing is they are expensive so you need to buy some and raise them but if you have the space they are easy and cheap in the long run.
Crickets are good if you grind them up well. They have pretty tough exoskeletons otherwise. When you do not gut feed or just gut feed them a little but not much or for long then their cal to phos ratio is about right for tamandua. I would have to dig it up but there was a study comparing the cal to phos in crickets fed various diets for various lengths.
My guys are not real fond of meal worms but I got some dry to mix in there food sometimes. The cal phos levels are not as good but they are okay occasionally. They are actually lower in cal and higher in phos than tamandua wild diet. In their case if raising yourself gut loading for higher cal would help. The low cal worms would also help if feeding a diet too high in cal already.
Pua loves most any sort of soft bodied grubs or beetle larvae but most of those we find wild around here in the woods when we get lucky. For some reason she was not interested in wax worms though Ori liked them when she was here.
The ideal to be a main part of the diet is silkworm pupae or adult worms but pupae is cheapest unless you raise your own then you still need silkworm food and roaches are tied at first. Silkworm are close in value to ants with the cal phos and iron levels. Roaches are about the same as feeding termites. The tamandua diet should be 4:1 phos/cal roaches are about 2/5 phos/cal(based on american roaches) there's still not a whole lot of info on their nutritional content of various roaches. But 2/5 is still very close to ideal and there is actually a bit of wiggle room.
Then low-gut loaded crickets.
Variety of lots of different kinds of insects can help even out the cal/phos out since some are high and some low.
Here's a basic guide on insect levels but like I pointed out at the start with another study on how much cricket vary based on diet they all can for the same reasonhttp://nagonline.net/Technical%20Papers ... DIFIED.pdf
Fresh water or river shrimp can be good too for mixed in food but they wont likely want them as treats.