Hi lilbebel
Yes increasing the progestogen dose is one solution for treating ongoing bleeding issues - because the amount of progestogen needed to prevent the adverse effects of oestrogen on the endometrium is dose dependent. More oestrogen needs more progestogen and this will vary between different women, exactly how much you need.
You will need to take the progesterone until the bleeding stops and all you can do then is to trial going back to 100 mg and see what happens. Personally when reducing, I would gradually reduce rather than suddenly as the sudden drop in progesterone might alos trigger bleeding ( though if the lining is thin again, it should not do so).
Sorry I have no experience of this myself though I do play around a bit with progesterone doses sometimes because I am on long cycle HRT ( OK with my GP) so if I've had a longer cycle one month ie longer without progesterone, I might take it for a bit longer the next cycle or shorten the cycle. With conti HRT you don't have that flexibility but should still work to stop bleeding, if in your case, it's the balance that is wrong.
Hurdity x