Mirror Side Support for Dopb on a Platform

I'm building an equatorial platform to use with my homebuilt 16" truss dob (built pretty closely per the B&K book). Currently, the mirror is in a sling. On a platform, the whole scope will tilt up to 7.5 degrees in either direction. Right now there are two bolts in the mirror cell that will keep the mirror from shifting laterally as the scope tilts over. But this means a force will be applied at a point to the mirror. Could this distort the mirror enough to produce problems? I have seen where some builders have used a double sling design with each sling angled in a different direction. This looks like a lot of retro-work to the mirror mount and I'm wondering if it's really needed. Thanks for any comments.