Within a Heat Lance oriented list, the Couronne will be perfect (even if most players prefer the Tourbillon over him). Think about the Toulons, who are better than the Marseilles.
Around small, I would not advice the Alma who are clearly too expansive for what they do. I think you should build your list around Lyons, Requin and/or Chevaliers. Lyons are your standard frigate, decent . In a Heat lance lsi, you can have good synergy with requins and chevalier, as pin-point give rather high chance to score "shredded defense" crit and make easy targets for boarding rush or 18AD of rocket !
I envoy to play the La Rochelle and the Magenta Mk1 (+1 ecuyer) as the Flag ship, allowing to play the La Rochhelle more aggressivly without taking too much risk with the Commodore's ship !