Hi, I have B+W 092 and 093 filters. The 092 is definitely the one to use for this film. I got decent results around EI 12, but you have to determine for yourself what EI you prefer. It is also developer dependent, so Xtol would give a different (higher) EI to HC-110 for example. The 092 is a very dark red filter, which also extends slightly into IR. It matches the sensitivity of SFX quite well. It is not a true IR filter like the 093, since it does pass some visible light, enough to be able to frame your shot through an SLR.
As an aside and more or less irrelevant to your post, I have used these filters on my IR modified D70. The 093 yields a monochrome image in the red and blue channels. No colour info whatsoever. The 092 yields a false-colour image with enough colour information to get some very interesting results. That tells you that you can play a bit with the 092's spectral response on different emulsions, while the 093 leaves no room for manoeuvring. I have not tried the Hoya R72, but it seems to be similar to the 092. Apparently, the 092 is the better filter for deep red/IR on film purposes, while the R72 is fine for false-colour on modified digital bodies. But this is hear-say - do some tests of your own if you can.
A nice way to shoot IR is to use a TLR with the filter only over the taking lens. That way you focus and frame in visible light, while the photo is made with the filter in place. You have to adjust the focus slightly, but if you are within hyperfocal limits you will be fine.
