so what is the best balancing method

I've been doing wheel alignments and wheel balancing for years.
The best balance is dynamic for sure, you can either do this with knock on weights on the outside, use stick on weights on the inside or a combination of knock on and stick on weights. The key to keeping stick on weighs on is to thoroughly clean the area where the weight goes on with tyre buff.
I wouldn't go putting antifreeze on the inside of your tyres, not good for today's rubber compounds. Bags of weight beads in truck tyres works ok, but not on passenger cars.