there is no way not to loose rankings..
Even when you do it properly - you will loose rankings and that will happen twice:
1) there will be a slight drop within the 2nd week;
2) you will start sliding down slowly for quite a time, after 4-6 weeks..
no 301-s, webmaster tools nor even Matt Cutts will be able to help you.
but you should be back within 2-3 months if you fight back.
The same applies when you move your site from http to https
-- my suggestion - work on powerful social signals very hard from high authority people from the day 1.
good luck,
Helmuts
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