Question about upgrading my water chamber

For quite awhile, I've had to tape all the edges of my H3i Humidaire humidifier on my ResMed Autoset Vantage S8 machine, in order to keep my leak rate low.
I was hoping to get an S9 soon, so I never replaced the possibly leaking water chamber, but finances have prohibited that. I recently found out that it wouldn't be expensive to just replace the water chamber, so that's what I did. They don't make the H3i any more, but rather make an "upgrade" to an H4i.
I've used it for 2 nights now, and unfortunately, the leak rate is still high. But then I started wondering..........its larger than the H3i, but there's no way of changing the H3i setting in the "Settings" menu. Would that change the meaning of the leak results??
I don't want to keep thinking I have an unacceptable leak, if the numbers are messed up now because the machine can't adjust to a different water chamber.
Thanks for your help!

I don't think the new humidifier would account for any leak rate. Sounds more like a mask issue to me.

If both chambers are actually leaking, why not just increase your "acceptable rate" by the amount the new chamber is actually leaking? It's a calculated number anyway. As long as it is low enough the machine can compensate, just raise your threshold.

I received an S8 AutoSet II this summer with an H4i humidifier. It reports in the menus as an H3i. I don't think there is anything to change, I bet electrically they're the same, just a different water chamber. This is how they can sell an upgrade kit.

Thanks everyone.