Very nice dual tone! and I like your tops. I can't wait for Lyn's tutorial, either!
You mention having just the two molds so you're stuck with certain amounts. I don't know if you're interested in making in-between amounts, but I have wooden molds that I modify so I can make various size batches. With a wood mold like that, you could get a piece of wood about 1/2- 1 inch think and cut it to the approximate dimensions of the inside of the mold. I set mine where I want it and then put something solid behind it- with that size you could use a scrap piece of 2x4 or something- and then I put down plastic wrap inside the part of the mold I want to use and a paper liner inside that. The plastic protects the mold in case it leaks a little and it's so nice being able to move the block to different places so I can vary the size of the batch. The 2x4 or in my case, some bookends, keep the false end from moving. It works well. Again, sorry if you know this or aren't really interested.