Alrighty thanks for the heads up, I've looked into this and there are two parts.
First of all, overloaded weapons are not applying their damage bonus to walls, so that explains the Cld. Nova Cannon. Fixed for the next release.
The Vortex Lance, on the other hand, is not a bug. If you tried a couple more times you would've made it through because it does 60-100 damage. I tried a bunch and even just standing next to the wall without any momentum it blasts through just fine, dealing the right range of damage.
The reason you didn't break through with all that momentum "bonus" is that there was really no bonus at all. The Vortex Lance does not benefit from speed and momentum, because although as a lance it falls under the "piercing melee weapon" category, it actually does EN damage, and the melee modifiers are assigned by damage type. Only true slashing/piercing/impact weapons benefit. You can see this reflected in the Modifiers context help, but technically the manual does say "All melee weapons benefit from greater momentum" etc., which will need to be modified.
It's a little confusing because melee weapons were originally split into three types that also matched their damage type, but then much much later (like over two years after that happened
) I decided to add some very special melee weapons that happen to have different damage types.
Adding a whole new weapon category for an individual weapon or two is kinda overkill, but then leaving it as we have it now can obviously also be confusing because we have weapons in a category named after a damage type that don't actually do that type of damage, even though technically these weapons are "shaped" like others of the same type...
It's kind of a dilemma.