Nothing wrong with those figures.
The hose for pcv valve only needs to be suitable for the valve and the nipple on the carb, generally 3/8.
It's the hose from the valve cover to the air filter that needs to be large, generally 5/8 or larger.
Under light throttle the air flows from the air filter into the crankcase back via the pcv valve to manifold vacuum. There is also little blowby.
Under moderate to heavy load, blowby is higher and there is no flow via the pcv valve, so air flows from the valve cover to the air filter, now in reverse.
If the blowby air is restricted like the small filter nipple you had on there (3/8), then crankcase pressure could build, dipstick comes out,
oil leaks etc.