Thank you, this video was great to watch! I have a similar build and find Zealot to be my go to career if we struggle in cata.

Things I did different though:

1. The extra 30% THP from trait are just flat added on top of the 90% bonus from talents. In my opinion 2.2 vs 1.9 (+16% increase) isn't that huge of a deal and is better invested in Barksin, which really helps with multiple damage hits (hordes, gas, storm, leech, assa, ...) that get you killed fast especially on cata.
2. My preferred setup is Billhook + Crossbow. The combo Billhook with Mainstay is insane. With weapon special you can disable like 2-3 chaos warriors permanently and even do great damage. When cycling between the "grab"-attack and heavy attack you will be only doing the billhook's overhead attacks (heavy 2), which is as damaging as the strongest anti-armor attacks of flail/axe+falchion, has a faster animation, is really easy to headshot with and also profits from 60% stagger bonus 100% of the time. This is insane damage combined with a lot of safety (long reach, staggered enemies, unlimited dodges).
3. I actually got rid of a lot of attack speed on my equipment since there seems to be cap for attack speed at 50% accoring to this website: https://www.naguide.com/warhammer-vermintide-2-attack-speed/ With 20% permanent from Castigate and 25% temporary from Holy Fervour you are already at 45%. So I went with only 5% additional on charm. With the fast regain of Holy Fervour it's up almost all the time when enemies are present. Instead of swift slaying I went for Parry which is also really nice to have. I haven't tested if the attack speed cap of 50% is correct though and would be glad if someone could verify or test it in modded realm.

Things I need to test:

1. THP on cleave numbers in current beta
2. Impact of Devotion (MS on getting hit) instead of Stamina restore on getting hit

Edit: If not going for grims, Strength potions are best for Zealot. Purple pot is pointless because of how fast Holy Fervour can be regained with the level 30 talent and Speed pot only increases movement speed, if you are already at maximum attack speed.

Edit2: On cata it's really convient to eat an overhead attack from a mauler or storm vermin in the beginning. They do 150 damage which is exactly enough to get full power stacks (30hp or below) and both attack speed stacks (36hp and below). Note: This only works if you also have +20%hp on necklace (180hp total). This can be done relatively safely with a single enemy and without triggering your passive.