Autoglym Tyre Dressing. Apply using sponge for a nice sheen. you can apply multiple coats and let dry for a glossier shine. it is silcone polymer based but won't sling if you do it right.
If you are that OCD about tire shine, I would just suggest to stick with CG VRP and just reapply when it goes "dull" for your standard. Its not that expensive so you shouldn't have to worry about putting more on.