I think your handsigns were perfect...but the DM may not have understood them. The hand-sweep is not part of "basic scuba talk."I pointed to the computer, did a horizontal sweep with my hand (which is what i was taught at some stage) and also an ok signal for good measure. I didn't signal up as my buddy was still completing the ss and I was planning to just hover there until she was ready to go up.
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http://www.neadc.org/CommonHandSignalsforScubaDiving.pdf
Note the similarities between hover, something is wrong, and your computer is cleared signals. The signals need to be slow and distinct.