i have had 7 visa exempt entries in the last 8 months. I never maxed out in any of those cases only staying about 15 days each time. except christmas-new years where it was 30 days. never had any questions, probably because I am not in the country that long. If I know advance that I will stay more than 60 days then I will get a visa. what the officers are looking for is a pattern - consecutive maxing out stays with very short border bounces. if you have that you might have problems