Not sure what kind of spreadsheet app your are using (if any) as I do not see any kind of formatting on what you have. I can't see any EOREOR at the end of any line, either. Also, it must saved is a tab-delimited text file.
You need to verify that in every v_model field, the data is unique. If any are repeated, the product will be overwritten with the info from the other one(s).
excel97 works for me but some do not care for it.
I suggest that you download a full text tab-delimited file from your install. Open it with the spreadsheet. Copy/Paste the EOREOR into every line in that column that you will need to upload.
Input your data into the correct fields and then sort (excel has a w/header row as a sort option. Verify that no v_model entry has been duplicated. Then save it to a tab-delimited text file and upload it. Until you are familar with how it all works, do not delete any unused columns.
If all of this is correct and it still fails, go back to the first entry on this topic and read the instructions.
BTW, I upload files with over 3000+ lines without any glitches, so the amount of products is NOT your problem.