All those components may have an octane higher than "premium" gasoline, but none will raise octane any more than the ratio at which you use it. In other words, the octane increase is in proportion to how much of those components you use, and you can only get up to the octane of this new component. (There is no replacement for tetra-ethyl lead.)
To get anything noticeable, you need something that alters the rate of combustion; something that has a delayed onset of combustion, then a rapid rate so that peak cylinder pressures are centered at 16 degrees or so ATC. This is (or around this value) is the best mechanical advantage of gas pressures pushing down on the piston. Think about spark timing - it starts around 35 BTDC, hopefully peak pressures are around 16 ATC, then pressures drop quickly after that due to cooling and expansion. If you could reduce the pressure build-up time more of the work would be done when the mechanical engine could take advantage of it. You would need things like picric acid or nitro-compounds.
Anything with oxygen brings added complications. The oxygen in the molecule leans out the mixture, so adding, for instance, a large amount of methanol, which is 50% oxygen, will raise the octane and lean the mixture. Further, it will cool the incoming mixture, too, so you have some good (octane and cool) and some bad (lean) and eventually the stock ECU can't figure out what to do.
BXT's are on the toxicological no-no lists. Benzene and xylene are great solvents, too, but jeez, keep them off your skin.
My opinion is that every example of where these things might have helped was because the engine wasn't tuned quite right (cam choice with fuel metering or air flow rates with vavle size, etc.) and the added fuel component was a bandaid, changing combustion rate or combustion timing to get back what the engien should have been doing.
