Yep, that was my experience as well. I tried it when the scrape feature first came out and saw that is was simply not working, as you also found out. I didn’t take it up with support though. They had just made a massive update to include the scraping that I had agitated for, and it was too much for me to complain and ask for more functionality at that time. I was hoping maybe that was something that was fixed/added in the meantime. But maybe a new feature request thread could nudge things in that direction in the future.
That’s why I was curious and suprised when you said you where doing that too and I was waiting to see if ended up working for you or not :-p It is a great idea though and it is a shame it does not work, cause there is a gap in the market at the moment for an app that can filter in bulk based on keywords and filters. I’m working on a project that will scrape in bulk and allow you to filter afterwards excel style, but that’s not quite the same and at any rate it’s not ready yet and won’t be ready in the short-short term.
Ha, I am the boss at complaining about MP and asking for more features lol. I combine use of Imristo, MP, and the tools I am working on to get to my end goal. Its not super convenient though for bulk pre-scraping, that’s why we need something more tailored to that use. Sorry that I don’t have any magic bullet… yet. If IG does not implode in the next months though, a solution will appear 
To get what you want, with the powerful MP filtering, your best bet right now is to just use the live-scraping functionality set up as many scrape accounts as you need and let em rip to provide you with high quality follow sources. So this is not pre-scraping, and you should use a list of sources as opposed to list of specific users. If you go all out with the scrape accounts, with redundancy, you can more or less ignore any scrape accounts having issues as you will get your resutls anyways.
Its a bit of a pain to setup a lot of scrape accounts and all that, but afterwards it is set and forget. You can of course also set it up to scrape and deposit results in the extracted user list and pick those out later to use as specific users, whatever you prefer. It will take a while to collect results at first, but if you plan ahead this is a viable strategy too. I have a few scrape accounts just collecting targeted users that I know I will use later down the line.
Another way to go is to take your big ol list of specific users that you where trying to use as specific users in the Scrape accounts and use them as specific users in the actual accounts doing the following. Do enable the use filters checkbox. This does work and will take of at least part of the API calls-load. The cool thing with this method is that you can also remove any users found in your ignore list and existing followers before putting your list in MP, so that helps a bit too. I am sure you know this already and want to avoid those extra API calls and all the troubleshooting that goes with that, but mentioning it for the heck of it :-p
All these methods work fine for now, they are just more work than we would like… I get that you are looking for the most painless way, but as it stands, we must still suffer a bit to get our results.
But onward forward to new solutions!
(there is no quota, but you gotta be reasonable and not abuse the option to ask for stuff if you want people, especially the devs, to still listen to you).
