Dear CH,
For your information, by the way you didn't know, when the contest is in "judging" period just the designer ranked first can send variations and updates of their logos.
If you want to ask for changes for any designer you need to rank him/her first.... after you can switch anytime the first rank position between designers and ask for the last changes to fine tune your logo before select the winner.
Bests and Good Luck
heru