Ok the levels that they were on what were the temps? Ill bet money that they were too low. The problem with having so many connections is just that there's more of a chance to have a connection go haywire and stop working. If I were you I'd go through every connection. And check the temps. Also I would completely change those multiple peices to 1 piece that gets weaved in and out if the rack. That way you only have 1 connection to go wrong and you'll know it bc the whole rack won't have heat.