This is also a forum post I have been watching with interest. I would be delighted to see if anyone can come up with a definitive solution.
One of my problems (I have many lol) is that my second toe is longer than my big toe. I know this is quite common with guys, so a lot of my blister issues are with them forming at end of toes (but I also get them in other areas). I have lost countless toenails as a result of this, sorry not a pleasant image I know.
Amongst other things I have tried with little or no effect are:
Liner socks
1000 mile socks
Gehwol foot cream
Micro porous tape
Different lacing techniques
One of the best solutions I have found is surgical spirts. It doesn't completely remove the issue but I have found this to be best solution so far.
A bottle can be picked up for under a couple of pound from most chemists. Apply daily to the areas you know will be affected with cotton wool or cotton buds. Do this for about 7-14 days before you do your walk. This hardens the skin so helps to make the area more resistant to blisters forming.
As I say different things work for different people. If anyone has any other solutions I am always happy to hear them.
Personally I have kind of resigned myself to the fact that I am just highly susceptible to them. I have also found stopping maybe once every 5 miles (or so) and completely removing boots and socks and just airing feet to also help, but not always the most practical when out with others or weather conditions dictate this is not suitable.
I shall be keeping an eye on this thread for any other feedback, although I fear for myself there is no panacea or silver bullet