Well, C1+cover is only very marginally better. Taking the numbers from above, C2 you get 10.8 vs. 8.4 (R=1.285), but if you take C1 and cover, you're at 9.9 vs. 7.65 (1.294). Unless if you just barely hit a jump point in attacking, it's probably the difference between 71.6% and 72.5% or something like that.