I recall having sent you a set of 60 degree "Tapered FS" blocks a while back. There are also pictures of the pieces on Voidgamers, but those aren't accessable most of the time. While they haven't been the most heavily cast mold in my collection by a long shot, I've used them in enough places to recommend releasing at least a partial set of your own (you're certainly welcome to use mine if you like, but that would just be flattering myself):
1" long - at least 2 different patterns to make sloped walls and overhangs
1/2" long - I've found a couple of other uses for this one without the above
1/4" filler - needed to realign rows if you stack tapered corneres
outside corner - a little more useful than the seperate left and right corners

The double and triple length tapered blocks are handy at times, but might not be worth the mold space unless you plan on a seperate Tapered mold.

I tried tackling a couple of round tapered blocks to make a 60 degree transition between 4" and 5" diameters, with the eventual idea of making the full set of 4 transition pieces from 4" to 6". It proved much more difficult than expected, and I scrapped both the idea and the first awful prototype. You might consider trying just a tapered wedge that could be used to ring the base of a tower, rather than an actual diameter transition block.

I also made a set of three FS ramp blocks, 1/4" high on one end and 1/2" on the other. Two of them are 1" square on top, and the other is a half-width 1"x1/2" piece. It looks really good for changes in floor elevation, and the taper is gradual enough to stand most miniatures on without having them topple over. It's one of those things that didn't seem like a big deal at the time, but now I'm wondering why I didn't make them sooner. One of these days I need to find a better image hosting site and put some of the pictures up with a few of the newer custom FS pieces, including the arched doorway for the 4" FS round tower (it fits the door from the FS Acc. mold). Seeing them in use gives a much better idea of whether they're worth their mold space or not.