Points to ponder ..
(a) for lighties at reasonable weight, performance is marginal regardless.
(b) blue line is a useful target at gross weight. At lower weights, the speed range for which climb may be possible expands a little
(c) if you are worried about clearing an obstacle after takeoff OEI .. then possibly/probably you are better off putting it back on the runway and, at least, having an opportunity of walking away from the wreck.
(d) if you are operating off a short runway with tiger country around, then you MUST accept a higher risk for light multi operation than if you are operating from a major airport with no obstacles to speak of ..
(e) eyeballing obstacles pre-takeoff is an exercise in wishful thinking and has little basis in reality
(f) shallow turn (say, 10-15 degree bank) is worth around 0.5 - 0.7 percent climb gradient loss depending on how you do the sums.
(g) better energy management to maximise height ... hence a better technique to climb out AEO at best ROC to maximise height before the OEI bit starts ... should that be your lot on the particular occasion.