Call of Cthulhu Houserules

I'm running a CoC (6e) campaign now and players are having a blast. That includes me. It is a homebrew story called Eyes of Nyarlothep, where players are tracking down the titular stones in a race against Nazis and conquistador cults. So far they've had shoot outs in El Paso, fought eldritch owl-things in the Antarctic, talked to ghouls under the streets of Paris, and are currently stuck on the moon in the antediluvian past.

I might publish this at some point. 

I have a terrible memory, so I've storified & simplified the rules. Suppose I should have used Trail of Cthulhu, but don't have enough confidence in knowing the system yet.

Maybe my next campaign?

Anyway, here are some houserules we've agreed on:

SANITY POINTS FOR MVP

Every week we decide on an MVP - someone whose roleplaying contributed most to the session, either in terms of fun or story progression. We've decided a d10 SAN recovery for this henceforth.

LUCK ROLL AS ORACLE

I use Luck rolls like Oracles in Ironsworn to decide things. Whenever players are assuming things about NPCs or the world, I ask what they expect, then tell that what I think is more probable. Then they roll a Luck roll to see whether their or my interpretation is what we go with. This gives them some agency, but also means the gameworld is as mysterious to me as to them, keeping me improvising and interested. I also adjust the Luck roll down (ie from POW x 5% to x3%) if they assumption is a slim chance or unrealistic. For instance, at the German Antarctic colony of Neu Schwabenland where they were, they wanted a CB radio. They failed their Luck roll, and had to find other ways of getting a message out, which I decided was via the German radio office.

ONE TIME SKILL CHANGES

Since players had no idea what skills they would need when they chose characters, I allow them to do a one time irreversible change of a skill to suit a need they encounter. Thus far two have changed a language skill to Spanish, which they needed to read an ancient conquistador's diary.

BURNING APP TO GET CONTACTS

Last, I allow players to choose to 'burn' an Appearance point to get a reliable contact, be it an old colleague, friend, family, or ally. This doesn't reduce the App number, just the pool of contacts they can call on. For instance, the old professor tacitly heading the party announced he had a dear friend and colleague at Miskatonic U where they headed with their cursed tome. He had an Appearance of 10, so can choose 9 other contacts in future.

ANYTHING ELSE?

Dear reader, are there any houserules that make CoC a better experience for you? Feel free to drop some wisdom in the comments.