ebb and flow sog why are these buds smaller

im running the same clones in soil and 2 in dwc and another room has 50 in a sog ebb and flow,in the first pic i have the dwc grown plants witch turned out to be the fattest buds in 50 days i ever seen maybe couse i have a dual air pump and 2 air stones in a 10l res.the other 2 pics are from the ebb and flow they are 45 days into flower.im confused why would the buds be soo much smaller some are almost the normal size but many are like they are retarded
ph was stable from the startfrom 5.7-6.0
ec from 1.0veg to
1.2 start of flowering
1.8 in the middle and now i got it at 1.4ec
temps 17-20 night 22-25day
chem nutes
they were never defficent now are atrting to yellow alittle bit,
is it maybe couse the table is crowded
thats a 7x4 feet table 50 plants in perlite,veg for 2 weeks

well it looks like you super cropped your plants. if thats true, then ive heard that every time you top your plant it will split the flow up evenly of the nutes to each new shoot. but say u topped them twice but didnt trim all the tops then u split up the flow of nutes. bassically some of the stalks are gettting more energy from the roots hense the bigger buds on some of the sites.

none of these were super croped,the ones on the ebb and flow were toped and thats it but when i did it before the buds were not smaller actualy it incresed my yeild

these buds are maturing showing brown hairs bud its like they missed the filling faze they didnt fill up still are lokking airy