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Archer is only capable of tracing weapons that has the output of A++ rank because of his 'down rank sickness'--An A++ rank output traced weapon can only be achieved by tracing an EX rank weapon, which when downgraded, is A++. So far there is no any weapon higher than EX rank so UBW's maximum rank is A++.
As for Shirou tracing Avalon, one thing is because he just too Avalon out the day before, so his magic circuits in him still take the shape of it, allowing Shirou to effortlessly trace Avalon(he skipped all steps of tracing). For Archer, it has been many years that Avalon has left his body, and his magic circuits no longer remember its shape.
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