What you have looks good, I would politely like to offer an alternative arrangement.
If your goal is to make this a 'medium weight' company, as stated, then I'd not include any assaults at all. (FYI I think the Battlemaster is fine in a generic FWL company, I just think its too heavy weight for this one). My offered revisions are designed to steer the company composition closer to that medium weight bracket. I'm assuming that this company is part of a FWL regiment that has heavy/assault lances in other companies.
Combine the functions of the command lance with the fire support lance, they may not always operate together (they may split into pairs instead) but on-paper they'd be organized as a lance. That leaves two lances as your fire/maneuver/scout component with some integrated fire support in the form of the Trebuchet.
Something like this.
Command Lance (Alpha Lance)
Orion
Rifleman
Archer
Hunchback
Fire and Maneuver Lance (Bravo Lance)
Shadow Hawk
Wolverine M
Trebuchet
Hermes II
Maneuver and Scout Lance (Charlie Lance)
Phoenix Hawk
Vulcan
Cicada (2B model)
Wasp
Primary tactics: Bravo and Charlie lances finds the enemy and fixes them in place, Bravo does most of the straight-up fighting, using a combination of direct and indirect (LRM) fire. They also have the speed and maneuverability to try and outflank the enemy, and to grab the best terrain. Charlie Lance can scout but also be used as a flanking force and to chase down fast vehicles and overrun infantry (with the Vulcan and -2B Cicada being infantry killers). The Hermes II driver, using the communications gear, keeps the Alpha Lance appraised of the situation and serves as the communication officer for the whole company. The slower Alpha lance is held in reserve, providing air defense (Rifleman), fire support (Archer and Rifleman), and command (Orion) functions. If and when elements of Alpha Lance get into a close quarters fight, the Hunchback serves as escort for Alpha. In situations where Alpha moves in first, they have Bravo in immediate support with Charlie deployed as skirmishers/flankers/scouts away from the Alpha/Bravo main body.
If the presence of the Shadow Hawk bothers you (not always seen as a FWL machine, though in 3025 it is manufactured by Earthwerks on Calloway VI), you can remove it and bump the Phoenix Hawk up to Bravo Lance, and add another lower weight medium or light to Charlie, like a Locust or Stinger. Or you could replace the Shadow Hawk with a Quickdraw, which the FWL does make.
