Aleph 5 4 ohm output issue

Not an expert on this by any means. So, I got a Aleph 5 clone board. In testing I found with a 8 ohm dummy load I get 62vpp while on a 4 ohm dummy load I get about 43vpp before clipping. Is this in the range I should be expecting or could I be current limited.
 
recalculate power and see is it in accord with factory data

62Vpp@8R is ((62/2/1.41)^2)/8=60W

43Vpp@4R is ((43/2/1.41)^2)/4=57W

if that not complies with factory one, culprit is in amount of Aleph CCS modulation, known around a Aleph CCS AC gain
 
Here are some pics
 

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