I just tried the recommended settings and they worked, no need of reboot or Ipsec restart, just need to bring down each tunnel individually, disable old IPsec tunnels, and enable new Connections tunnels and it worked like a charm. I also setup the manual SPDs using the new "Child" option instead of setting a numeric Reqid.
For anyone else looking to implement this don't forget to first remove the existing SPDs by looking up their Reqid in the "Manual" tab and then removing those entries from the "Installed" tab list of the SP database, before bringing up the migrated tunnels.
For anyone else looking to implement this don't forget to first remove the existing SPDs by looking up their Reqid in the "Manual" tab and then removing those entries from the "Installed" tab list of the SP database, before bringing up the migrated tunnels.