in last 500% conversion day, i did some expriment, that involved not just few money expense:
(1) convert expert and stop at first successful after one win:
expense: about 400 x 100 experts packs
earn: 3 x RN engineer from 410 to 450 one RN engineer from 416-476, a few scout from 250 to 300
(2)convert a set of crew tracing the hotspots:
currently you know it is about random function. The variables you can think of, is login name, login session, ip, sailor name, sailor id, level, exp, vet, recuit, cursor location, sailor array id, sailor slot id, convertsion rate, AND THE TIME, etc. There you will come to a short conclusion that, once you have found a successful conversion, the "hotspots" will move to next unkown sailor after unkown duration. All you need to do, is to find the pattern. And this is different for different player.
expense: 200 x 100 expert packs
earn: 3 x RN engineer from 450 to 470, 4 x km engineer from 430 to 470
(3)leave a BO and only 1 sailor in queue. put them onto the ship, put everything else into HQ
now here is the magic
expense: 30 x 100 expert pack
4 x KM engineer from 470 to 500
(*) remember, i blamed SDE for nerfing the chance too last year.
(*) this things will be changed since I TELL YOU, you were supposed to find this out by youselves.
i spend 200x 100 expert pack and get:
7x scout from 300 to 330
4x repair from 200 to 360