WYW oils are AWESOME and yes they are that STRONG, you have to try the vanilla grapefruit, it is so strong and a great fresh clean scent, and the peach melba WOW, I better stop there or I'll be here all night, LOL
1oz to a lb of wax is generally the rule of thumb for a strong scented pillar, you can use less but your throw will be weaker, your oil shouldn't pool to the bottom if you have mix it well at the right temp.