need your suggestion/expertise on my single loop pissing flow issue

[NapalmV5]

well i would like to thank you all for all your suggestions you guys have guided me and put me on the right track thats for sure and the systems running like a champ now

much appreciated

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heres my fully watercooled system.. saturday i removed the 3rd gtx580 in the hope of getting better flow but quite the opposite turned out.. i removed one of the 2 radiators and still low flow.. atm the flow is so bad its like the 1800gph pump is not even on

the inlet is at @ gpus and the outlet is @ raid controller

1800gph pump -> (35-38 foot tubing) -> gpus -> eheim 1250 pump -> cpu -> mobo chipsets -> mobo vrm -> ram -> raid controller -> (10 foot tubing) -> eheim 1250 pump -> (25-28 foot tubing) -> radiator -> reservoir

total tubing @ 90-95 feet

what you guys think? should i install another eheim 1250 between the ram and raid blocks and another eheim 1250 between the radiator and reservoir ?? will 2x more eheim 1250 help out at all?? or remove the current eheim 1250s and get 3x-4x eheim 1260 pumps instead or remove the eheim 1250s and the 1800ghp pump and just get a single quite beastly pump.. Q is.. is there such??