Sorry as well, as I also missed the fact that this was a 48T -;(
You should leave auto-neg enabled, and if your servers are coming up at 100M full, it would appear that is what they are negotiating to with the switch.
Documentation on what actually happens with auto-neg removed/disabled is unclear, and I am trying to find that info, but I would NOT use that setting in any production environment unless you have some external form of Server redundancy. It is the 2nd link below, I am seeking answers for.