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30 lb T&P is Relieving at 33, yet boiler temp is only 175
Looks like 30 lb. T&P is performing as it should.
Seems odd for this residential boiler to be running much above 25psi at these temps.
Aquastat is pretty much ruled out as we just have too much pressure at this temp.
Possibilities include the flue which appears clear, internal unit cleaning which has been done (not certain how well), and I guess there is always the chance the circ pump is delivering lower than spec'd gpm. It circulates seemingly well enough, but just have too much pressure for the temp.