Sub-frame connectors... Please build them correctly!

All I know is before welding in Seymour Scamps connectors I bought off him here on FABO, I couldn't jack the car up from the side. It would just droop the front end. After welding them in I can jack it up no prob. It also made a discernible difference in the overall feel of the car. Is integrating into the floor even more beneficial? Probably. But for my street strip Duster these are more than satisfactory at adding rigidity and strength. And yes those are two seperate but equally important functions to be considered when doing any chassis improvements IMO.