I just thaught of a compound to test.

I know this is gonna sound silly but...
A cousin of mine, along time ago didn't have any tim for his p4.
So he used diaper rash ointment.
A month or 2 later I replaced it with as ceramic, for the heck of it, he didn't need it but I figuered it could help and why not replace it with something that is supposed to work better.

Well, in that 1 case, the only time that I've compared diaper rash ointment as a tim, it had a lower delta then as ceramic did at those higher temps that he normally ran at.
After replacing with as ceramic, his temps were higher, not lower at all.
I sat there for a half hour waiting for it to break in and lower temps below that of his make shift tim, and it never did.

So if you you are willing, probably not...
Try testing some diaper rash ointment.
I'm not sure what kind it has to be or anything though.

I'm semi serious about this.
It's probably not the best, but it might beat some of the other tim's out there.

I've never used it myself.
I just remembered it now and it got me thinking.
If it is worth something..., then perhaps we can just make our own tim or something that works better then at least as5 or as ceramic out of cheap stuffs.

I'm not joking though dudes, and I'm not trying to troll or anything.