Check the diaphragm first they are quite sensitive.
Also check your one way valve to see if it is damaged and allowing the air to reverse flow.
Diaphragm compressors do tend to puff so the pressure tends to pulse, the pipe in the handle before the regulator would have helped to reduce this effect this and allow the pressure to be a little more constant. So you could replace this with a spacing pipe.
Did you use ptfe around all the joins to ensure a good seal? Put a little water and washing up liquid over the joins and see if you get any bubbles.
A reserve tank and secondary regulator can make a big difference but by the time you have spent the money you may be better off with a bigger rotary compressor with a reserve tank built in.
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