Reckon I can get a new connector, and just use a screwdriver to push the wires in? I dont have a IDC inserting tool.

I have worked with IDC connectors for 20 years.....basic rule, not designed for multistranded cables.
You can use a small screwdriver to terminate, be sure to push the wires just above and below the insulation displacement blades otherwise you can damage or spread them wider, making for a worse connection(if that makes sense)