Update.
Thanks for the great advice. After lots of adjustments, I upgraded the pump to a mag 9, and put on a gated valve for fine adjustments to the input water flow (the manual suggested a ball valve - but definately the gated valve gives way more control).
There was a very significant increase of production. The input valve now allows a finer control from a very dry skimmate to a high volume of wet skimmate.
The tradeoff is a bigger pump to a much better controlled skimmer with higher production but associated noise and water heating - but I have no regrets in the skimmer or the use of the bigger pump.
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Oceanic 70g, 30g sump, Acqua c ev-180, Solaris PRO led, 60 ils LR, 50lbs of live sand, 1 foxface, six line wrasse, 2 clown, 1 Royal Gamma, 2 brain coral, star polyp, colt coral, torch coral. | 
