I've hit walls straight on at like 140 for sure, possibly higher and had like maybe half a ring worth of damage on 4 pips, so over an entire ring without pips. I do understand the shield is downgraded, which is why I boosted it up with 4 A4 boosters.
I sorta follow this following link for my shield decisions, and never had issues with a piracy asp w/ 3A shields(Double downgrade!), or a vulture with 4A shields ramming into things or doing combat, never with shield boosters on either.
https://docs.google.com/spreadsheet...ES69Lc317U/pubhtml?gid=2011892275&single=true
The math based on this says that I have 789.12, which makes a 6a shield about 76% as effective as my current setup. (Though, this entire chart could be wrong, or inaccurate.)
Also, defining my hit. It was like a skim hit. I made it past like almost half of the landing pads inside the station before exploding. It didn't stop, or even really slow me down at all.
Picture to help define.
http://imgur.com/jjfog4r
@ Furrycat
http://imgur.com/LPeQTOg @ 170