As for "came across" - I can agree, perhaps, that it looks sort of more idiomatic, but why is it so much better to use "I wonder" instead of "I'm curious"? The same applies to my "should-phrase" which, I'm sure, is both grammatically and combinatorially correct.
Thank you for your observation anyway - I'm not really in the habit of arguing on the slippery questions of compatability unless armed with a heavy dictionary, but we have a native here as far as I understand) Rep, a wonderful opportunity for you to be of assistance!;)
By "locals" I meant us - those on the forum.