If you're planning to retake ochem at Pacific, it might not be the best choice. Most people say ochem is harder at Pacific and opt to take it elsewhere over the summer. I don't know how many of them have taken ochem at 2 different colleges to actually make a reliable assessment. Even then, if they took it at 2 different colleges, odds are it's because they didn't do so well the first time. Maybe they just had an easier time the second time around since, at that point, they've had prior experience. Classes will probably be difficult no matter where you take them.
As for curves, it depends on the professor. Usually, there's no curve that works against you. If you have 90% you should be guaranteed an A or A-. Some teacher's don't curve, while some curve down based on the performance of the class. Class sizes are definitely smaller and the community is very helpful. It's definitely not as competitive as I've heard Berkeley to be. Quite honestly, most people are here to get by, not to excel. There are some who excel as usual, but people usually help each other out. It almost feels like high school 2.0 merely by the fact that it's a small campus and almost everyone knows each other.
Even if you meet the requirements and it really is the Pre-Dental Advantage program that you're transferring into, you're still only guaranteed an interview. I have a friend who got mostly As, maybe a few Bs, and had DAT scores paralleling mine with scores hovering around 23 or 24, and he didn't get in this year. The "guarantee" isn't so perfect. Just a forewarning.
Again, this is just the general feeling I got around campus. Maybe I just happened to be in the right places at the right times. Maybe not. Anyways, hope I've helped. Good luck
P.S. Classes rarely reach 100 students. And if only 5 people got As, it's because only 5 people got grades deserving of As. The other 95 relied on the "curve fairy" or just wanted to pass and didn't care for the A.
P.P.S. Sorry if there are any grammar errors or spelling errors. My laptop's touchpad is very buggy and likes to click on random things as I type.