Try swapping out that tier 1 hp regen for something like Quick Switch. Val should be using her whole kit, a LOT. and saving time there is crucial. Keeping the monster pissed and slowed, maintaining markers, and of course- getting out the med gun. HP regen wont do much for Val against competent monsters IMO. With proper positioning you shouldnt be taking abilities not meant for you in the first place- meaning you have no reason to regen HP there, and once/if you ARE being focused, hp regen wont do anything for you anyways either. Quick switch though can often allow you to utilize all 3 pieces of your gear, in plenty of situations where youd only have gotten away with using 2.
For tier 2 and 3, try taking perks that either give you mobility- Jet pack recharge for example (More actual dodges will get you out of more danger than jumping slightly higher IMO), or the nifty new after burner perks. The extra distance can really make the difference between dodging something, and eating something even if you did try to dodge it- Or some more “combat” oriented perks- Capacity works on val, as does reload and the likes (While capacity only works for your medgun, reload benefits your medgun, rifle, and tranqs).
R-Val is intentionally “easier” to use. They wanted a medic who could heal, while sticking quite heavily on her weapons. OG-Val requires a bit more micro management. You NEED to be using all of her kit, constantly. Put a tranq in, put a marker on, heal up whoevers low, and repeat. If your team is mitigating damage well- Just keep cycling her weapons. Tranq the monster, add 2 markers, tranq it again- And repeat until someone needs healing. Dont be afraid to use your healburst- But do your best to coordinate it around your supports shield. if your supports shield is down, try to be save it for yourself. if the situation is “Use this to save that guy, then get focused because my burst is gone and the supports shield is on cooldown”, save it for your damn self. One of vals strong points is her capacity to QUICKLY pick people up from a down. Its not great to let people go down mind you- But its far better THEY go down, than YOU go down.
Keep val at long range- Wherever the monster is, you shouldnt be. Utilize terrain- Hide behind pillar, ducking out only to get markers/traqns, then hiding again- Keeping LoS on only your team mates. When/if you get focused- Run around those pillars. Let your support buff whatever it is they buff, and let the trapper use their CC to make it a pain in the ass to get you. If youre going ot kite- make sure you kite AROUND your assault, and not away. In the end its primarily damaging the monster that is going to make them think twice about what theyre doing