Based on kill ratio comparisons of the Hurricane to other Allied fighters against the same Axis opposition. For example F4F and Hurricane v same or similar Japanese oppostion, Hawk v Hurricane v the same German or Japanese opposition. So it has nothing to do specifically with how Axis air arms stacked up against Allied in respects other than a/c.
I think this thread alone shows that there is indeed more to consider than just a/c.
1. French Hawks did at least as well v Bf109 in 1940 than Hurricane (measureably better but not to a highly statistically significant degree).
2. Hurricane results in PTO are not as far out of line with Hurricane results v the LW as some seem to initially assume. So the Hurricane results in PTO are not as strange and in need of extraordinary explanations as they would be if the Hurricane units really had been typically fully competitive with the German fighter units, which is again seems to the common reputation among some.
It would seem that in both Sitzkrieg and BoF period the statistical edge rests with the H-75A though it also appears that the level of Hurricane engagement was greater which is a factor to consider. (I look forward to reading the source you used, been wanting one covering that period!) The Sitzkrieg period figures show the H-75 in better light until it is realized that the bulk of Hurricane/109 engagements were much more limited, occuring near the end of the period, further exaserbated by the tactical situations, two of which went badly for the RAF thus impacting the summary. For me, I find the results interesting more for what they might indicate about the state of French fighter pilot exp and training vs. the machines (which were similar). For the Burma example, I maintain that its just too limited to do more than a cursory comparison and B's recent analysis shows that within this limited scope the Mohawk drivers enjoyed better odds than their Hurricane compatriots.
On point 2, I do consider it out of line as i've found that any summary result over 3:1 to be an exception vs. a rule and one that indicates an imbalance of one or more factors.(usually more than one) Thus an explanation is indeed warented. It may not be as extreme as the 35:0 (or 30:0 as you calculated) experienced during a five month period over Malta, but it was still considered unusual enough that the RAF sent a troubleshooter to Burma to try to get to the bottom of it. Regading the F4F comparison, I guess we'll have to continue to disagree on the situation being similar for the Hurricane/F4F in the critical periods.