We use the Burkert 5404 to good effect in all 3 of our heavyweight flippers.

We use two to fire and a third to vent- gives us plenty of power even with the smaller 75mm bore ram in Maelstrom. The main thing we would recommend is a decent size buffer. Manta uses two, 2kg buffers with one 2kg main tank and a 100mm bore, 150mm stroke ram. Maelstrom and Earthquake only have one buffer but both have smaller rams.

Feel free to message me on here or via facebook and I can show you the various setups we have.