I think the key to most paste waxes is apply razor thin...Im sure most will agree.
That being said, easiest to remove for me are: P21S, CG 50/50, Pennacle Series 2, Megs Ultimate paste wax, Fuzion, and Souveran
20 min is way too long for BV. Next time try waxing two panels then removing. Or one large panel then remove. Removal of BV should be done when the wax is tacky. It shouldn't pass the swipe test. If it does pass, you waited too long.
BF Midnight sun is one if the easiest waxes to remove period.