Indeed, some "features" you do likely want to ignore. Set these columns in your properties file with the "classifier_ignore_columns" setting. Something like
classifier_ignore_columns = ImageNumber, ObjectNumber, .*_Location_Center_.*
As for the rest of your workflow, you seem to be overcomplicating it. So let's simplify!
For CellProfiler Analyst to work, it expects a database, so you should use ExportToSpreadsheet. Howver, you apparently are, since it says so in your properties file? Perhaps you are using both ExportToSpreadsheet and ExportToDatabase, which is technically ok, but it will essentially duplicate your output. I would suggest just using only ExportToDatabase > SQLite as you are doing and then download a sqlite browser so you can look at the output tables in your database as listed in your properties file = Z:\Staff\Sheila\CellProfiler\20150817\SQLite.db
In the .db file, you will find the Per_Image and Per_Object tables already formed with all the requisite Cell object numbers and locations, etc. In fact, you shouldn't NEED to look there for CPA to function, but it is good to inspect your data. Your main configuration for CPA is only your properties file.
Hope that helps!