The descent/ascent of the waterfall below the boulder is relatively easy, maybe a C scramble. On the way up the kloof we usually start up an obvious lower angled section some way to the left (~20-25m) of the waterfall (looking upstream). Once at the top of the scramble there is again a fairly obvious climb to the right (moving around the arete) and down to get to the stream above the waterfall and cross to the right bank where you can walk easily up to the right of the huge boulder.
My guess is that you were too close to the waterfall and should have been further away around the arete to the right (facing downstream).
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. Apologies for the terrible picture but my work pc only has paint