(continuing this under Xotl's aegis from the other thread)
WiGEs aren't VTOLs. VTOLs are using thrust to maintain altitude, and by the p67 rules, don't get to decide to drop. WiGEs and their 'air cushions' either drop, or pay additional MP to maintain altitude (as per p55). While certain functions of WiGEs, VTOLs, and even LAMS get lumped together under some circumstances, they're very different modes of transport - hence the differences involved.
So in the L6 to L1 example, the p55 rules apply.