I agree with Phew that the stats on the new shields seem to have been concocted by someone who probably doesn't play a shielder with any frequency, if at all. I like that there's new stuff to try, but some of it really needs tweaking in order to be balanced correctly with everything else. These are my proposed stats:
Hand Pavise Shield
weight: 5
body armor: 7
difficulty: 4
hit points: 411
speed rating: 100
shield height: 55
shield width: 50
Giving it the Hand Pavise these stats would make it a decent alternative to the other 100 speed shields out there as opposed to a straight replacement for the other 100 speed shields out there. One of the things that's actually lacking among 100 speed shields at the moment is one with high HP (Knightly Heater and Kite are fast and high resistance, Elite Cavalry is fast and high width), so changing the stats to this would make it fulfill the niche of "fast and high HP" and fit in with the theme of a mini board shield, which is what it's supposed to be.
Reducing its hp to 300 something instead and leaving the body armor on it untouched would make it too similar to the Knightly Kite shield in terms of stats and make it a very unappealing choice compared to the Elite Cavalry Shield for pretty much every shielder out there due to 14 width being far more important than a paltry 50 HP.
Triangle Shield
weight: 7
body armor: 10
difficulty: 5
hit points: 417
speed rating: 97
shield height: 92
shield width: 44
slots: 1
One thing that's sorely lacking among shields with high (as in 5+) requirements is one that doesn't require 2 slots. The Steel Shield and Huscarl Shield are both 2 slot, and the normal Steel Buckler was previously 1 slot (now 0 slot) but was honestly not worth using over any normal shield if you liked living.
If you want to make the Triangle Shield both useful and different from existing shield choices while not making it unquestionably better than existing shield choices, making the above changes fills in the niche for a high shield skill shield that isn't 2 slot. A Triangle Shield with these stats wouldn't outmode either of the board shields, because both the 1 slot and 2 slot board shields would still offer better hp, resistance, and width. It also wouldn't outmode the different full size kite shields, because they would offer better hp, resistance, and price for someone whose build wouldn't benefit from the Triangle Shield being 1 slot.
Furthermore, giving the Triangle Shield these stats is a sensible decision from a general design standpoint. You will have made it more in line statistically with the kite shields, which it visually resembles, and making it 1 slot fits with the fact that every other existing shield with less than 8 weight (and isn't a buckler) is currently 1 slot.