So I altered the htaccess files which allowed the install to proceed. Enabling the 2 to 3 times faster option worked and only had to create the /opt/local/www/blogs/BLOGNAME/wp-content/wfcache directory manually also had to open up perms to 777n which Im not thrilled about but will play with to see what user needs to own it so I can lock it down.
Enabling the falcon engine crashed the site with a 500 internal server error. I looked at the htaccess now and saw this:
cat .htaccess
#WFIPBLOCKS - Do not remove this line. Disable Web Caching in Wordfence to remove this data.
Order Deny,Allow
#Do not remove this line. Disable Web Caching in Wordfence to remove this data - WFIPBLOCKS
#WFCACHECODE - Do not remove this line. Disable Web Caching in Wordfence to remove this data.
<IfModule mod_deflate.c>
AddOutputFilterByType DEFLATE text/css text/x-component application/x-javascript application/javascript text/javascript text/x-js text/html text/richtext image/svg+xml text/plain text/xsd text/xsl text/xml image/x-icon application/json
<IfModule mod_headers.c>
Header append Vary User-Agent env=!dont-vary
</IfModule>
<IfModule mod_mime.c>
AddOutputFilter DEFL
~
As you can see it looks like it didn't write the whole file. Im going to try turning off. Replacing the file with original and then re-enabling to see if it writes completely.
tim