Well, weirdly enough, it's while comparing the rangers vs blood berrets that i came to that solution.
In the first edition, profiles/skills are not paid including weapons, so the point cost difference of 1 pt is not due to the MW difference, but rather because of the invader costing 8 vs the panzerknacker's 7.
The weapons have (sadly) been costed in a complete vacuum, regardless of the bearers's MW.
Blood berrets get -1 CC, +1MW, +1LD, -1 ST, -2 A compared to a venusian ranger
Both have jungle training, and the Ranger have "reliability" while Berrets have "to the last warrior". The rangers are more versatile, while berrets pack more punch in a shoot-out. Both squads suffer a bit from an off-topic sergeant.
As you can see, the stats themselves balance out rather well except he -2A characteristic. While one could say that there's little point in having +1 CC and +1 ST, i ought to remind you that in a jungle table , lines of sight are invariably bad and CC is bound to come around. The rangers fare better in CC than blood berrets for sure. The little 1 point of difference in ST allows rangers to parry up to ST of 3, increasing survivability vs individuals and cc elites (and encourage you to put bayonets). Jungle tables might be the only place where the shotgun of the ranger sergeant might see use.
Having 26 A doesn't make the blood berret a better jungle fighter, it simply makes the trooper a worthwhile elite soldier.
At least that's my point of view. It doesn't mean it's the end all of the analysis but it made us switch to 26 A for blood beret troopers and so far no one (including me) has any problem when fighting the more resilient version.