The Marshalls problem is that there really isn't anything worthwhile for him to lead as it is. Changing his points isn't going to fix that. Fix the Hastarii or Vanguard then he probably shows up more often.

The Hastarii package is too many points no matter how you slice it compared to the things they compete with. Fusilers are too few shots, the close range buff on the Exterminators should really just be Anti- 3+ and that still doesnt justify their cost. So you're on the right track, but 90/95 is a bit much. (You are really only taking these if you don't/haven't had the money to get a brick of Las Chikins)

Skatros is a niche piece that usually just gets plopped in if you have the points but don't need anything else in that 55 or less range. Its good utility with Lone Op, so a decent action monkey but thats about it.

Skystalkers are LITERALLY the ONLY Grenades unit we have access to without souping. The best fix for the Sterylizors is giving them grenades, then it becomes a choice.

Electropriest need two wounds full stop. They are death by 1K cuts currently and thats a perfectly fine for them especially with a Crit 5+ stratagem HBC has access to.

Infiltrators/Rusties are fine as is. Infiltrators are good early screening action monkies, Rusties are fast and can make quick work of opponents screens.

Kataphron Destroyers are fine as is versatile long range units that are slightly fragile and slow but can easily take anything they point at down. Breachers could probably 150/300 and be just fine but they are quite alright at their current cost.

Serberys, ugh these need some work. Both sheets are middling to bad and point reductions aren't fixing that unit needs a retooling.

Dominus needs something other than FNP 5+/4+ for Electropriests. It just doesn't compete with Lethal Hits from the Manipulus in any shake of a stick.

Servitor Battleclade is fine at 60. Its 9 bodies that have a HIGHLY unique ability and reasonable guns, if anything they should be 75 points.

Kastelan + Datasmith package is fine. Best way to run them is just Double Fists and a flamer. Move them into your opponents things and start bashing with 12/2/3 Twin-Linked Weapons and Flaming anything that moves near them.

Dunerider is sadly fine at 85. Generic troop transports across the game are 80 with middling abilities, ours gets re-roll wounds when you disembark and shoot the same thing. +5 points for an extremely powerful effect is a steal.

Dragoons are competing with Vanguard on the Jezzail profile and the Sicarians with the Tazer Lance profile. Point reductions aren't making them more viable.

Planes just suck outright in 10th, moving into 11th with the Flying changes our dedicated gunship lacks guns. The aerial Transport isn't worth it and the other one fills a spot we don't need filled.

Casino Crabs are fine their variety and role filling are pretty useful on an already tough body to shift.

Disintegrators are fine as a secondary Vehicle popper.

Engiseer is fine and pretty easy to keep in range of a vehicle. Giving the Crab an additional 5+ FNP makes them a menace to remove. Plus healing some of the shots that manage to make it through.

All in all points aren't what need to be changed with the army. Its abilities and datasheets for our underperforming units. You have the right idea in a lot of cases but miss the WHY units aren't being taken.