Do you have any .htaccess files in any of your UBB directories? Do any of them indicate to use a different PHP version?
No, Nothing like that.
The PHP info page in the control panel is a generic phpinfo() page, which just reads out what the server is reporting.
I suspected as much, which is why I did a phpinfo() check myself.
Fyi, the 5.6 branch of PHP is quite fast.
Well, that at least is good to know.