HOWEVER it should never be so close to the tortoises back that it can get overheated. Maybe 10-12" from the substrate at the minumum. A little higher is better and placed so it keeps the whole enclosure at or above the tortoises minimum needs at floor level. And DON"T use a clamp lamp! Hang...
There will only be as many as their environment will support. A full house means a clean house for the tortoises. I gotta get me some of these. Sow bugs(Isopods)are great house cleaners as well as food for some tortoises. This is responsible environmentalism for your tortoises.
I'd say it "helps" but soaking 40-45 minutes at least 5 days a week is much better but every day is better. Yours is still young enough it should help a lot. Post again in a year and lets see how it looks. By then your youngster should be 33-50% bigger
I'd have to add that as to what I can see your young one is not perfectly smooth on top at all but is pyramiding. With living conditions cannot see why but would be adding soaks and see if it starts smoothing out. The H2O dish is likely not deep enough to do the job.