I recieved some new pots today 500k volume and tone and can't tell the difference. Which is which? Also I've read alot about the 300k vs. the 500k pots. I currently have the stock 300k pots volume pots and the 100k tone pot in my 1990 LP. Can I combined the 300k volume with the 500k tone? Or should I just go 500 all the way.