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Dear Gape,
Many congratulations on constructing what appears to be a highly productive borehole!
It is difficult to give specific advice without learning more about your borehole (geological log, construction log, aquifer type). For example I am presuming that the water strike at 44mbgl was not your main productive unit as this appears to have been cased off!
However as a general rule you do not want to lower the water level within the borehole below your main productive units. Therefore I would position your pump above these during the test (so probably a couple of meters above the well screen).
Best wishes,
Geraint