The new horse backbump changed has made this class completely unplayable I am afraid.
Its not that you cant do the bump-remove block-hit (typical bumpslash), although that was the 1h cav main weapon (lacking range over other types of cav). The issue is that right now, any infantry can dodge you so easly, either by moving AWAY or moving TOWARDS.
So you now have such a small field of effective attack, that you cant kill anyone but unsuspecting stationary targets (guess how many that means). If the enemy is moving, it either moves out of range (range being quite small, even with the longest 105 sword) or it moves closer so you bump the target, canceling your attack.
Remember, unlike lance cav and bow cav, sword cav CANNOT attack foward targets, only sideways. That means you *WILL* bump unless the target is positioned perfectly for you to pass besides it. In any real combat situation it means you mostly fail your swing.
This is a great shame, 1h cav being hardly overpowered and in fact the hardest and weakest cav style (being so vulnarable to all sorts of weapons) and took a lot of skill.
