Last set of Larsen press 4x2 with 425, followed by 2x2 using the slingshot with 455.
I use this variation of the bench press for my own training as well as for my @granitestatepowerlifting athletes for three main reasons:
1 - flat back on the bench increases ROM
2 - keeping feet in the air removes all leg drive, which puts a huge emphasis on creating upward force with the pecs
3 - having feet in the air also causes stability issues which the core has to compensate for
The net result is a raw press that carries over very well to competition.