Thanks for your responses-
what do you think the loads are that these blocks see?
I am thinking of doing the triple fiddle top blocks and keeping my lower older blocks for a 12.1 but wasn't sure. I kind of like the idea of the 8:1 then a "fine tune" 16:1 but I just am worried about the extra line getting caught in one of the sheaves. Of course the drawback is the ability to blow the sheet and have it run out in time or not taking a half hour to sheet back in after a reach or run and ending up with a mile a sheet at your feet.