I am pleased for your sake that you have lost weight, but I would caution others against using this method. You are a T2 with (presumably) still some insulin production, you're an adult and it's up to you what you do, BUT and it's a huge big BUT... it should never be tried by T1s as it can lead very quickly to diabetic ketoacidosis and prove fatal in a very short period. Ditto for any T2 who has lost their own insulin production. Withholding insulin doses is well known as an eating disorder and not to be encouraged by this forum.
Only way insulin lowers bgs is by turning excess glucose into fat . Ermmm? Don't diabetics suffer from excess glucose? Why give them stuff to make the excess glucose turn to fat if you want them to lose weight?
Sorry, you have that rather askew, although you do say "excess glucose". The action of insulin is to make it possible for glucose in the blood to enter cells and be turned into energy, if of course you have too much glucose for your energy needs then yes, it will be stored as fat but that is the same for anyone with a working pancreas... if you eat more than your body needs for fuel then it will indeed make you fat. So it's not insulin to blame per se... but an excess of fuel.
Lack of insulin means that the energy (glucose) cannot be used so in effect you are starving your body.
I know pioglitazone worked the same way... convert the glucose in the blood to fat, hence the patient sees lower levels of blood glucose BUT puts on weight. It's the putting on weight that means you see the lower bg levels in essence then. And then get even worse issues with not being able to naturally use the insulin in the body. The "gliclazide" type drugs do the same thing.
Pioglitazone has a dual action, one to sensitise the body so it can use the fuel and the second to stop the liver releasing excess glucose. As I said above it's action is not to turn BG into fat, unless of course there is excess glucose or fuel over and above what the body needs.
Of course, couple either of those things with the barking advice handed out by many in the NHS to base your meals around unnecessary amounts of carbohydrate and no wonder people find it hard to lose weight.
MOby, you don't say what levels of BG you've been having, but do remember that too much glucose in the blood can lead to inflammation of the arteries and thus heart disease. Plus of course nyou will feel rough I imagine.