Pass Aleph Questions

I know I've posted a few questions about the Aleph 3 thus far, and I both own and love this amplifier. Even the bass is sufficient with my Proac 2.5's. But I'm about to upgrade to an Aleph 5 for a couple of reasons. The following are a combination of reasons and questions - any experience, insight, or info would be greatly appreciated.

1. The low power of the Aleph 3 (30 wpc Class A) requires that I have to turn the volume up to 3 o'clock on my Rogue 66 preamp. I don't think it causes any detriment to the sound, but don't know. Is it a bad thing to have to crank the volume control on the preamp up that high?

2. Does this volume control issue have anything to do with the input inpedence of the Aleph series? The Aleph 3 has an input inpedence of around 27 kohm and the Rogue 66 has an output impedence of 650 ohm. Using a 10:1 ratio, I've been told this should not present a problem. Is this true? Does it account for the response to the volume control, or is that more a power issue. The Aleph 5 has a single ended input impedence of 10 kohm. The Rogue 66 still falls under the 10:1 rule of thumb. Can anyone say whether this would cause any problems?

3. The Aleph 5 has both balanced and RCA inputs, which would give me more flexibility with cabling and cable distance. Shouldn't balanced cables be better with longer runs?

4. Peter at Pass Labs says that the Aleph 5 is sonically an improvement over the Aleph 3. I don't think everyone necessarily agrees with that. Has anyone compared the two and formed conclusions?

Thanks All.