I tried all options and speedgrader doesn't seem to allow one grade for the entire group
Hi steve davis, welcome to the community.
By default, when you create a group assignment Canvas sets it up so that all students receive the same grade. When you are looking in SpeedGrader are you seeing student names or group names? If you are seeing student names one of two things is happening, 1) you have the assignment configured to grade each student individually in the assignment settings or 2) you didn't associate the assignment with a group that had students in it. Remember that you have to create a group set and then the groups and either automatically or manually assign students to the groups. If they aren't assigned to groups, even if you associate a group set to the assignment, Canvas doesn't know who is in the groups so it will show student names and those names will not be associated with a group. Unfortunately, This has bitten many a Canvas user if this is the case. Check these things out and reply back if you have more questions.
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