ummm
not sure I understand your post but :
1) Fan 1 must blow OUT of the case
2) Fan 4 must blow INTO the case (some might say the contr. but)
3) Fan 2 ¿? I am not sure what you did , but it is not a good solution to tamper with the cpu cooling space. If needed, get rid of the CPU fan and heat sink and get a better air cooling cpu fan/solution for your CPU slot (there are good and cheap ones)
4) Fan 3 (¿?) if used to cool the GPU, must blow OUT air from the chips (like CPU). Do not understand very well what you did with fan3 .... I would remove the two pci slots covers at the bottom and attach 2 small fans there blowing OUT of the case...