Cars been going really well in this configuration, definitely won't be going back to the other layout! Been experimenting with 30-50g weight under the lipo in different conditions.
12mm seems a long way to drill the rear shock position! We've drilled ours about 6mm further in and has been working well.
I would definitely recommend this layout, moving the rear shocks 6mm further in on the rear tower, removing the weight from the slipper and 30-50g under the lipo