we have had the RIR since it was a day old but we got the SLW in early September and it's been about a month now since we started getting eggs.This time of year they don't usually lay very well. If they are in a runn with a coop for them to get into out of the weather, you can add a light and that will help the laying problem some.
How long have you had them? Sometimes it takes them a while to recuperate from being moved.
I see that you said you put a light in the coop.
Sometimes you just need to give them time. As far as th RIR goes depends on the lines they are from may not start laying until it is 7 to 8 months old.
It could also be that the SLW's are taking turns laying.