The Excel,is from UCDAVIS,and it is much Better in Hotter climates,than Ontario Ca.
I think your will get better once it get older,but it will never be up to the potential it has in your cold climates.
Here in NJ,I had bad tasting one in the second year,and much better in the Third.
Then something happened and the tree died,so now I have another young one I am growing.
It barelly ,marginally,have enough heat in my climate,but northen than here,I do not think so.
I am on 40 degree northen latitude here.
H2