In addition of Rahul's answers I would like to provide some additional information.
1) Let me come back to your initial request. You said that your optimization with GRSM did not provide a satisfying solution. I would suggest to investigate this. Please, find attached some good practices on GRSM use that may help you to get insight on your optimization.
2) Menu File --> Export archive allows packaging the study files in archive file (.hstx).
3) The values precision for continuous dvs is managed internally by HyperStudy. If you would like that dvs take specific values (with less decimals) you may prefer using discrete variables instead of continuous ones. Thus, you can specify the variation step (ex. 0.1) in the allowed range.
Hope it helps.