Weapons: valiance for both classes. Helmet: vim for vhl, pneuma for lr.(both reduce max hp though, but the upsides are nothing to scoff at)
Cape enhancements: unlike other enhancements, those come with downsides that can either hurt hard or be ineffective to your class, so with that being said:

For vhl: Vainglory while outside of ultras(15% more damage, 50% less heals from non % heal sources) lament against targets that your vhl has a hard time tanking(25% less damage received, 50% less dot damage) otherwise just use luck/normal forge enhancement.

Not sure about lr, but since it doesn't seem to have guaranteed crits, lament i guess? (20% crit chance at cost of 5% less haste)

As a side note, here's some classes you might enjoy with forge:

Elysium on archmage turns it into the best farming class in the game.

Dragon of time with elysium and penuma goes hard, faster than LR in farming. While being slightly weaker than Vhl in soloing. (432353 for bosses, 234353 for farming).

Horc evader with elysium and vim while being kept at 20 mp or less can hit 100% effective dodge while landing 10k to 12k bursts, turning him into a diet YnR(you need to have a battle pet or no pet in slot though).

Shaman with elysium, penuma and lament can easily make it a great farming class, allowing you to land 9k/10ks 70% of the time while also giving it better dps improvement and damage survivability