I'd suggest you pay a visit to www.bcyfibers.com. This is one of the two major manufacturers of string material. Thety have their own brand of string wax, but the general recommendation is to use newer waxes with silicon. Now I ask. Who would know better than those who manufacture the string material.

There are a lot of waxes with silicon. Some of the better ones are White Lightning, Black Lightning, String Snot, Scorpion Venom, and others. Personally I've been using BCY ML6 for nearly 20 years.

Your question about how frequent to wax is always up for debate. I shoot in the neighborhood of 8000 shots a year and wax about 3 times each year. I honestly believe many people wax their strings more than necessary and put too much wax on too boot. Wax should not be caked on nor shoould the string be dry to the touch. The whole idea of the wax is to penetrate the fibers (strands) and keep abrasion to a minimum. Too much wax does nothing more than give dirt or grit something to stick to which eventually gets rubbed into the string causing shortening of their useful life.