If you're only going as high as kronstadt and you are definately going to keep your restorer then you may aswell keep the seaman, cos its just as much a waste as the restorer is...
For a crew that was aiming for BB6 I'd have recommeneded you replaced both the restorer and the seaman with Engis (and that you started rotating more supports in there to actually have a full crew by the time you reached 120) but if you really want to keep the restorer then I dunno what to suggest. You realise that keeping it until you cap then means that youve leveled something completely useless once you've reached the cap? (Or something that is, at best, a really bad repairer)
If you actually want to play the kronstadt and do so then you could cap your SD without having a restorer not long after reaching it, maybe mid 80s, especially with supports on the T slots instead of AA.
SN really isnt the nation you'd go for if you like speed... quite the opposite, its easily the slowest nation of all :/ With good engineers though you can maintain decent speed even with AA guns but again this is at higher levels...
To plainly answer your question, no, thats a pretty bad setup excluding wether you go for AA or supports on T slots because both of those types of setups are viable. For your particular circumstance? Sticking with a restorer isnt a good idea, and the seaman wont contribute, if you like speed you will NEED engineers to get anything remotely resembling speed.