i want to expand the aoi putting together thos two with the reservoir and the 240 and 120 radiator.
That pump isn't strong enough to handle that much radiator with that much tubing and the block and that much resistance with that low a volume of flow.
Ever see a geisha walk? Those tiny little footsteps? That's the asetek pump on that aio. What you need is a pump that'll give you a full man's stride.
If you plan on doing custom loop, then actually do a custom loop, Franken-loops rarely work as intended or expected.