Tessnip, by default (the original version) changes the compressed flag, so it uncompresses all the data. This makes it significantly larger. I remember trying to save a copy of the esm and it bumped it to ~333mb or so. 800's a bit much though. I don't think that's an easy fix to change, though. If it was something you might be interested in, I've been looking for a solid hex based batch editing.. where I could select the list of records, and modify the same subrecord in each (preferably able to choose a set of bytes), or inside a record, batch editing subrecords for a single set of bytes. Ideally where it could be modified, or set (modifying all the values by +32, say, or setting to 128, having the option of either). Like SkyEdit's batch function, but in hex rather than graphically.
I'm not going to hold my breath on this one, though...
