House hack - rinse and repeat?

[Pat Needham]

I bought and moved into a 2-family duplex about half a year ago now, with a FHA mortgage and 5% down payment. In the next 6-12 months I want to attempt the same thing, but of course with a conventional mortgage this time due to the restriction of having only 1 FHA loan at a time. A couple things I'm curious about:

Is there a general rule of thumb regarding the minimum down payment percentage? For example, before I chose the lender I went with earlier this year, I had discussions with a mortgage person from Chase who mentioned it would have to be 15% down payment after I told them I was looking for a 2 unit multi-family. Are there any lenders that allow 10% down payments for a conventional mortgage on a 2-unit house, and does the fact that I'd be keeping my current residence after moving into the new one affect that in any way?

And second, if I plan to convert the unit I'm currently living in into another rental after eventually moving out, would I still be able to keep the FHA mortgage despite the house no longer being owner-occupied?