Strengthen a Vasemode print with Sprayfoam v2

Please see the announcement Video where I "improve" 5 different 3D-printable designs:
https://youtu.be/en_qw3RvsaI

This is the continuation of my project where i want to use a 3D-printer and sprayfoam to quickly make a rigid RC-Airplane.:

https://youtu.be/mNmZMD_lUN0

Sadly the slicer is not very happy about this geometry, and printing this now takes twice as long as if I would print this without the "bridges".

If you have any experience on how to set up my slicer for this task, plea