I've found that with the current firmware (v8) the Chop function doesn't seem to be fully working. When I set it above 0, it will only effectively behave as Chop=1. In other words, I can only get a "double note" out of it. Chopping to 3 or 4 notes doesn't seem to be outputting additional note on/off values.
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What is your Time division set to? ARP's division limit is 32/1, so at 16/1 it'll only sub divide once.
With fast argeggios, you can try using Ratchets instead.
I've just tried the V8 firmware and chops seems to be working as designed.
One other suggestion is to try lowering the Gate length and/or setting voice mode to MONO. It could be that the Synth cannot handle the amount of MIDI data being generated. I'm just guessing, without knowing your setup, so forgive me if I'm miles out.
Let me know your thoughts. If there is an issue, I'll get it sorted.