regarding #1.
Illuminarti did a little experiment and if I remember right, the ratio of infill speed to printing speed is the same for the bottom layer. So for example if print speed is 100mm/sec and infill at 150mm/sec and bottom layer is 10mm/sec then the bottom layer infill will be at 15mm/sec.
This is kind of silly. In fact the infill speed should only affect the cross hatch open infill (e.g. when 20% infill) and should not affect top and bottom infill. But that's how it is right now.
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illuminarti 18
1) Yes, this is a known issue. I posted about it on here in a thread last week. I agree that it is more intuitive for the first later speed to be a cap, not to adjust according to the ratio of infill/print speed, when doing the infill.
2) What you are seeing is speed-related under-extrusion. See http://www.extrudable.me/2013/04/18/exploring-extrusion-variability-and-limits/for full details of this. If you have an ulticontroller, you can adjust the flow on the fly, or adjsut it from the print interface in Pronterface/Cura etc. Alternatively you might look at Cura plugins like TweakAtZ as a way to adjust things at certain layers of the print (I think you can adjsut the flow, but I haven't looked at it in a long time).
Alternatively, consider simply not printing infill faster than the perimeters - it's not necessarily a good idea - you might get better results printing at a constant speed, since that keeps the head pressure constant, and minimizes oozing.
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