First, stop giving canned fruit & veggies, better to do frozen (unseasoned) if can't do fresh. I use combo of fresh & frozen.
Please choose a diet from the list of reputable diets under "diets" in the Gliderpedia.
If you need to order ingredients, while waiting try using cooked egg or chicken, baby food chicken, and yogurt for a licky treat (use your finger, or a spoon as I do, if your glider bites you) this is great for bonding. As mentioned supplement with f/v and may still need cal sup until you have your glider on appropriate glider.
I personally like the original HPW, I purchase the kit made by Exotic Nutrition and purchase it from Sugar Glider Super Store website. All you need is the honey, bottled water & eggs. Follow the instructions on package. The kit contains the correct amounts of Wombaroo & bee pollen. I find it's fairly economical and easy to purchase, prepare & serve.
On this diet there is no need for added supplements, just fruit & veggies. I do leave a few of the pellets my girls love scattered around in some of their play things/area for a foraging treat.
That's just what I find works for me, you may find something else works better for you