Buds not getting bigger

Oh and another thing, people growing weed VERY often use too much magnesium, imo. I mean, it's one of the most common things I see, along with excess potassium. The ratio of magnesium to calcium (especially in supplements) is often VERY skewed towards magnesium. Yet, calcium is FAR more prevalent in nature, and it's kinda difficult to use too much calcium. You can have a soil mix that's like 40% calcium and still grow things fine (though it'd be very loose soil).

Oh just a sidenote about that. The thing about potassium is that the plants reuse it, it's not a "building block" like calcium, carbon, nitrogen, phosphorus, etc, but a transient factor which circulates in the plant. You don't want too much of it coz the plants don't shed it much at all.

Lack of calcium? Phosphorus? Carbs/sugars earlier? Just general speculation. Coz it's really difficult to say. But seriously, I'd kinda recommend a "semi-flush" and some phosphorus, carbs/oils/sugars. Kinda looks like you got too much potassium (many nodes, leaves). Fewer nodes tend to produce larger/denser/more complex buds. But then, a lot of people don't know that topping, LST, all that sort of thing messes with the plant's hormonal balance (irreversibly). Less nodes = larger buds.