IMO-

-Curb SMN's burst somehow, in a way that isn't going to completely shaft the class in most scenarios (basically, curb it in a way that stacking multiple SMNs on one team is not going to be anywhere near as effective as it is now, this, by extension, would not at all affect Wolves' Den, since you cannot stack SMNs there)

-Remove/rework Battle High/Fever

This is just from what I've observed in Seize, and I have the same gripes with it as I did with Slaughter, unlike Slaughter however, I don't think personal LBs would be as much of an issue if the current High/Fever effects were taken out of the equation. Copy-pasting Slaughter's setup into a new mode with no consideration for balance was not a healthy move, imo.

At this point I'm only sticking around in Seize for the coat; and once I have that I'll be queueing Secure for FL almost exclusively, most likely.