Sure.Would you abe able to elaborate on these two things ie (1) your rules changes and (2) how their PCs have revealed themselves to be bland and ineffective?
The only CoC I've played recently is Cthulhu Dark, which (as the name suggests via word-play) is very "lite" with a simple but (as I've experienced it) effective resolution system and rather colourful PCs.
"Bland & inane" because of poor Player choices during char gen and attitude during play. Not everyone, not all the time, but mostly.
Pcs are actually very capable from the get-go in this game, Gumshoe's Trail of Cthulhu, and I admit I like it a lot.
Usual problems IME with new Pcs: not much investment in background, personality and, more important, in relating to Npcs.
That's why I started focusing, on my part, on Npcs, and how they relate to Players' investigation, out of curiosity, greed, personal interests. Also to teach them that the course of the game might change drastically if they don't take measures pro, or against, the Npcs involved.
We're getting there, I hope.
(To be cont...)