Re: The Hero System is bland and over complicated
The other thing that helps with SAN in a CoC game featuring repeated encounters with mythos beasts are the optional rules for repeated exposures. I can't remember how these worked precisely, but I seem to remember they were as follows:
Short term: once you've lost SAN equal to the maximum that one creature can inflict in one hour, you're immune to SAN loss from that creature type for the rest of the hour. So once you lost 6 SAN from seeing Deep Ones (1d6 SAN loss), you don't lose any more from the other ones you meet for the short term.
Long term: once you succeed in a number of SAN rolls against a creature type equal to the maximum SAN loss potential, then you are treated as automatically succeednig in SAN rolls against that creature type forever. For example, a Deep One inflicts 1d6 SAN loss on a fail, 0 on a success... so once you succeed in 6 SAN rolls for seeing Deep Ones, you never lose any more SAN from seeing them, ever.
In both caes, you're not helped when seeing Cthulhu. Given that he causes 1d100/1d10 SAN loss, by the time either rule kicks in, you've lost 100 SAN and are now permanently insane... unless the encounters were over time and you have some VERY good counselling.
I think the rules made sense. They were printed as optional because they stood a chance of damaging the feel... but I think they're good and would probably use them.