Higher Res Output of Photogrammetry in Sampler?

Hello - 

I'm trying to do something that I'll freely admit is a bit abitious. I'm hoping to use sampler to create a photogrammetry model of a small building site/hillside. I have EXCELLENT drone photography. I'm able to import everything, and everything lines up beautifully. However I find myself struggling to get an output that is as dense and detailed as I like. I work with laser scanned data professionally, and have the CPU/GPU to handle very dense (5+ gig) datasets with ease. I've enabled a Mesh Post Process layer on my mesh after briniging it in from the photogrammetry portion of the app, and tried playing with some of the values, but I can't seem to get anything that's noticibly more detailed. All my exported OBJs come out at like 110 megs, tops. Am I hitting some sort of internal limit of what the software will allow? Also - would be really nice for large objects like this if the texture mapping settings could go above 4096x4096. But really, I feel like the biggest thing holding this feature back is the limitation on mesh size/density. Am I doing it wrong, or is this the current limitation? 

-Sky