My answer is just a long way to subscribe so I can find out too.
From what I read, going to a full boil effects color and hops utilization. You will get a lighter colored beer and greater hops utilization with a full boil. Your OG should not be effected by your pot size. However, your boil off will rate will effect your OG if you don't hit your final volume. Boil off is a related to the pot shape and the heat being applied. Larger surface area (short fat pot), more boil off. Lots of heat, more boil off.