On the TC discount, from another thread on Bulgarians
If we’re gonna change Bulgarians, that’s what we change. I think the bonus could be interesting if we kept it as a bonus that only kicks in Castle age or later, but make it a static 50 stone discount, and have it apply to Towers. That way, they’ll have a unique push and map control style being able to put up very inexpensive defenses (along with the Krepost) and it supplements a drush FC, which is arguably their best strategy. They get FU towers, and Towers are a good supplement to the Bulgarian army given how they don’t have a FU archer or CA line to fall back on.
I think this is the most robust and unique method to change them and if we aren’t going to expand this bonus, it should be removed as I’ve described earlier as it’s really weighing down the civ.