I forced myself to modify the crossmember in the evenings this week. Reason being that when the engine and trans assembly went in last week the back of the trans pan butted up against the crossmember because of the 1" setback, and the Energy Suspension mount would not sit on it. Fair enough.
I cut and moved the flanges 1" to account for the need, and added some gussets; also moved them 1/4" up, which effectively dropped the crossmember removing the interference with the floor pan (because using a jack to reshape the floor as per the installation instructions is just a shitty concept). Further to this I sectioned the transmount surface down about 1/4". All of this allowed the crossmember to be fit easier into the chassis, the nearly 2" tall transmount to be used, and got the floorboard clear allowing me to reinstall the PS heat shielding (and avoid cooking Natasha's feet with header and cat heat).
Right now the driveline angle is sitting at 4* down - which is workable.