Increase Service Console Memory via Kickstart Script

Folks,  I've tried to use the following in my %POST% section of my Kickstart scripted install but it kills my host.  I'm trying to increase the Service Console RAM to 800MB.

1. This section configures Service Console Memory to 800MB

mv -f /etc/vmware/esx.conf /tmp/esx.conf.bak

sed -e 's/boot\/memsize = \"272\"/boot\/mesize = \"800\"/g' /tmp/esx.conf.bak >> /etc/vmware/esx.conf

mv -f /boot/grub/grub.conf /tmp/grub.conf.bak

sed -e 's/uppermem 277504/uppermem 523264/g' -e 's/mem=272M/mem=800M/g' /tmp/grub.conf.bak >> /boot/grub/grub.conf

I get the attached error on reboot....

Any ideas?