Sorry guy's 170 to 5 won't work for the 737 NG (700 anyway)
We already need to fly 160 to 4ish gear down flap 15 in order to gaurentee stability. This is at the companies direction after numerous unstable approach's with just flap 5 to 4. I doubt they'd be happy to do this at 170. Given that people tend to begin to slow shortly after 5 in any case the suggested change would in effect give us an extra 10 kts to lose in what would be a less draggy config. 160 to 5 would work for us and is the standard speed europe wide.