Render limits too low on outskirts of London

I'm mainly active in the SE of London, and the default renderlimits are easily hit due to the dense concentration of portals towards, and a little way off, the top left of the screen.

Doubling the portal, line and field limits, and decreasing the overdraw from 0.3 to 0.1 is enough to solve the issue

e.g. This view http://www.ingress.com/intel?latE6=51414304&lngE6=99907&z=11

(a separate issue - the renderlimit warning message is not always displayed at the bottom of the screen - not sure why)