The problem stems from the amount of water used for reconstitution and the accuracy of the syringe.
For example, if you use 3 ml for 10 doses of 0.3 ml, and you end up with 0.02 ml (2 units) left over, that amounts to a 6-7% loss on the dose. In your case, the loss is closer to 20%. That’s why lab pens often have 0.6 ml per dose, it’s more precise.
3 or 5ml syringes are harder to read than 1ml syringes. When I use only a small amount of water (0.5 to 1.2 ml), I use an insulin syringe.
In short, dilute more and use the syringe size closest to the volume you need for reconstitution.
You'll have to find your sweet spot between ease of reconstitution and the volume you want to inject. For 10 units, I use pens. I just received a Gansulin: it's my new favorite toy

For example, if you use 3 ml for 10 doses of 0.3 ml, and you end up with 0.02 ml (2 units) left over, that amounts to a 6-7% loss on the dose. In your case, the loss is closer to 20%. That’s why lab pens often have 0.6 ml per dose, it’s more precise.
3 or 5ml syringes are harder to read than 1ml syringes. When I use only a small amount of water (0.5 to 1.2 ml), I use an insulin syringe.
In short, dilute more and use the syringe size closest to the volume you need for reconstitution.
You'll have to find your sweet spot between ease of reconstitution and the volume you want to inject. For 10 units, I use pens. I just received a Gansulin: it's my new favorite toy

