Power
Hello,
I'm emphatically with Brian on this one; on the mizzen, all the runners do is to keep the head of the mast from popping forward in a chop, or from the minor strain of a mizzen stays'l. On the main you are expecting them to do for the forestay what the backstay does for the jibstay. You probably would never even consider having a mere 4:1 purchase on the backstay, right?
Taking the line to the winch gives you the appropriate power, BUT please remember that the turning block (and its padeye) will take something like 150% of the runner load. A snatch block is extremely unlikely to be up to this, and the erratic nature of the loads won't be kind to it either. You don't want to be installing a missile here, so land herky, dedicated blocks, scaled to the load.
Fair leads,
Brion Toss
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