ignoring VM value because I don't want to do that math, and assuming you one shot the entire time

0 bog clears is 3.293x Melt value
10 bog clears quagmire is worth 3.412x melt value
20 bog clears quagmire is 3.539x melt value
30 bog clears quagmire is 3.6316x melt value
40 bog clears quagmire is 3.538x melt value
50 bog clears quagmire is 3.255x melt value