Hey there,

Before I tackle the question in hand, I'd like to voice an opinion here, which I'd say, convoy is much safer than plunder to do. For the sake of an example, let's * to SS convoy/plunder.
While convoying, you get at least 15 coupons for sure, if you manage to complete it without problem then 30. You are able to ask for a support of stronger player, and have guaranteed rewards, plus no consequences of doing convoy.
On the other hand, while doing plunder, there is a high chance of getting 0 coupons instead of 150, for the following reasons: You need to find SS convoy to plunder, which is not always so easy, and each convoy may be protected by someone stronger than you (unless you are top of the server).
Plunder takes much more time, high risk of getting nothing at all, and on top of that, after you complete plunder, you are at risk of losing coins due to red name. Of course there are ways to go around that, but it's still an inconvenience. Just a tiny touch to fini* off, you get 4 convoys, and 3 plunders. That means, there is always a way to go unplundered, if you find a right time to do so ^^

Personally, being in top 5 of server power ranking, I find plunder to be a waste of time and too much of a risk to go with.

That being said, I apologize for this rant-ish part of my answer, what concerns a drop rate of SS missions, I agree it may sometimes be lower, but at the same time, the time frame for it is not small.
Personally I often skip SS convoy because of lack of time, and just go with coins, which are almost never getting plundered, and much easier to get.
I appreciate the suggestion to increase the droprate of SS missions though, thanks for that ^^

I could try to do so, although I have no easy access to such data.
The best I could achieve is to ask for such information for groups on my server, but that would be a really narrow picture. I can't promise I will do it, because it depends on how successful my "datamining" would be, although the opinion I stated was from my own perspective.

It's true that many people do get higher income from plundering, but at the same time, they need to devote much more time to it. The perspective I've shown was my own experience of plunder being a really unpleasant activity to do, besides the "toxicity", that's basically nonexistant on my server.

So, to sum up, if I decide to do such an investigation, it will be a very limited information source, because my merger is not very big, we have only a few people that actually plunder, and a rather non-toxic environment that surrounds convoy/plunder overall, at least from my own experience.

Thing is, that's just my personal opinion, but 1.0 convoy/plunder system was really good in my opinion.
I don't mind the current one at all, although doing convoy in pairs, as well as being able to do both convoy and plunder was really nice :)

That being said, if there are any suggestions for this situation, please let me know, I will forward them.
I can see that even if both systems are "not bad" in my eyes, it may be different for other players, so any feedback here is appreciated.

In my situation, which I described, right post-merge, I was about 9th in rankings, I believe, with 40-50k power range.
Our top 3 are 100k, 90k, and 84k (estimates). Those 3 people are in other group than me.
I do plunder, and all 3 tried are protected by them. That was my plunder record for first 2 weeks of the merged server. Now, when my server is just much "slower", although not "dead" per say yet, it just takes too much time to do plunder.

Where I'm going with it, it went from "fast but impossible = 0 coupons" to "slow, but maybe 50 coupons if I luck out and find someone".

The situation you describe could technically work, but it depends on where the rest of the top 10 is in the groups. I understand how it works for you, the situation I present is just my perspective of the system.