It's going to be over a 30 foot diagonal? That's over 432 square feet of screen space. This projector is horrendously underpowered and I don't have a solution for you. This is a cinema sized screen in a space which isn't at all a cinema. To be clear, theaters use $100,000+ projectors, but they can get away with $5,000 projectors for advertisements and such because they have good light control.
You will lose about 1,000 lumens because you aren't using the full 16:10 aspect ratio.
In a COMPLETELY dark space, about 6,500 lumens would be required for an acceptable image. If the projector delivered every single actual lumen (unlikely), it would still fall well under the minimum recommendation for a home theater environment.
In reality, a 10,000-15,000 lumen projector, from a rental, would be a requirement. I might consider getting something off of eBay that is native 4:3 aspect ratio to begin with, has a few years on it, and is MUCH brighter if a rental isn't available. Really though, I don't have good ideas here. This projector is a solid boardroom projector for a 120" screen. It's not going to work on a screen 9 times that size. In reality, this just calls for a multi-projector setup and a couple hundred grand to do right. I'm guessing that isn't practical.
