Agreed, and that’s because there are relevant exceptions to the rule. After spending more time than I should have reading about that, I ended up using climb almost all the time, at least for roughing. I tried to summarize what I read here, but it’s obviously biased by my interpretation, others are very welcome to disagree. In your case I think climb will help though, by pushing chips behind the cutter.
Yes (plunge feedrate ignored if there is a ramp). I would not go lower than 48ipm to maintain a large enough chipload (0.001" at 50%WOC, which will be the case during the helical ramping)