Weird, drop rate shouldn't be changed at all. Perhaps just super unlucky? Could invest in a SAGMill early on to break down gravel into flint.I finally got some flint, but it seems really low drop rate.
Unfortunately, Real Life is throwing me more curve-balls. I'm in the process of looking for a new place to move to, due to having to move by July. Unfortunately that timetable is being moved up, so I have to step up the search heavily and get all my ducks in a row to get out sooner. Nothing drastic like "2 weeks", but its enough that until its worked out, I won't have time to create a ton of quests and test them as well.
So the plan for now is to get the MFR quests written out and tested, add a few more Production contracts, and have it submitted by Saturday. Mekanism quests will be the update after that, probably the 2 week marker as usual.
Times subject to change, but I will get the MFR quest update done by this weekend since it also has the EnderIO crash bug and some other crash bug fixes.