Kind of wonder where you get these percents at for advantage/disadvantage. I could be wrong but isn't the rule roll a additional d20 an high goes to advantage an low goes to disadvantage. If you have both it's nullified except for halflings that can reroll 1s.
If this is the case bless an the other spell will have more value than you say since the percent is not 100% accurate.
Last edited by fallenj; 01/11/20 06:37 PM.