I think that the character you try to promote will be elites and heroes and they will come. Vets arez only that vets and their point limit seems quite ok if the next unit: Elites and Heroes are implement with 2000 and 2500 points.
The real answer is just let the vets be a full time thing. It's only 400 LP and you only get 1. That's basically whatever shit you are running +an iron halo. +40 armor. Big fucking deal. That's not even toughness, but armor. So I can take 1.5 more bolter rounds and still 1 shot by most melee weapons. Sooo OP.
I just realized the +400LP isn't enough enough to include the veteran surviability item for free. You're essentially a wee bit tankier, but at the cost of 200LP from your normal build as well as taking up the incredible 1st accessory slot.
My personal opnion on veterans is that they don't feel "elite". I am not talking about how long they take to kill someone but how fast they die . To me they should last longer (specially as they are limited). I would sugest giving more equipament slots to them and keep the LP, so you can put weaker weapons but keep them very resistent. Its annoying how fast you die with one.
I just unlocked Rank 5 and need a few more points for mine, and I greatly look forward to kitting out some setups that Just don't quite fit into my regulars... I think the bonus is just right... and it is definitely noticeable in many situations when downing an enemy vet loadout.
Jeah... but those items are also too pricey for what they actually do. Not even the Chaos-Sigils are worth the price they are at the moment