Is it ethical to cherry-pick reviewers based on their previous reviews of your manuscript?
There are ZERO ethics involved.  First, you suspect, but do not know, who the original reviewers were.  You may be right, you may be wrong.

Next, suggestions for potential reviewers are just that -- suggestions.  It is the responsibility of the editor to pick appropriate reviewers, and your suggestions are just one potential source of information in the process of doing so.

I'd say even if you recommend people who you respect to referee your papers, they'll surprise you regularly with critical reviews (if they're doing their job).

The biggest ethical quandry you can get into in the process of recommending referees is probably some sort of pre-arrangement with those you suggest.  This is to be avoided as less than stellar behavior.