In that dive test SOME up pitch to come back to level is desireable. It''s just that you want it to me moderate, nor extreme. For a model of that size look for a first rotation to level from a 45 degree nose down attitude to take about a 100 to 120 foot loss. If it rotates to level in less than that then you are nose heavy. If around that to 150 I''d say you''re in good shape.