If I use a pre-shave oil at all I use the Truefitt&Hill variety. I rarely use it, however, since switching to straight razors. For one thing, I don't like it on my hands when I'm using a straight so I need to add a "wash hands" step to the routine. I also feel that there is less of a benefit (in terms of smoothness or glide) when oil is used with a straight rather than a DE. No scientific data, just my opinion based on my experience.

I think a lot of guys add a little glycerine to their lather in order to get a bit more glide so you might try that as well. Me? I have been very happy with Castle Forbes creams and, lately, SRD soap in addition to MWF soap.

Good luck.