Sounds like you are off to a good start Paul, just watch the eggs closely. If they get too wet they will begin to expand and blow up like a water balloon, developing visible weak spots in the shell that look like cracks that are almost transparent. If you see this, it is probably too late to save them. They should be nice and smooth, but not bulging and "sweaty".
I used perlite last year, did the 1:1 ratio and it seemed to be just a little too wet, but as long as your eggs are sitting on top of the perlite and not partially burried, they should be ok. Perlite lets off moisture very easily, especially when too wet and it can over-hydrate the eggs. You will know if it is too wet by seeing excess water in the bottom of the egg container not absorbed by the perlite.
I also found that I had to put water in every available reservoir that the bottom of the HovaBator would allow to maintain good humidity. I also put a few extra containers of water around the egg containers where I had room. Sounds like a lot, but if you have the HovaBator ventillated properly, all the standing water will maintain on average about 75% humidity. If you don't have one already, go pick up one of those cheap, small round humidity guages from a pet shop and toss it in there where you can see it without having to open the incubator so you can keep an eye on things easily.