About Downsample in simulink without using rate transition block

Hello,

I want to use simulink to downsample a signal. When I use the downsample factor 3, I expect to have [1,4,7,10,……]， however in the model, it always give me the interpolate values in between the time series data. [1,1,1,4,4,4,7,7,7,10,……] Could you please advise?

Actually, my data is sampled per 0.5ms, and then I need to get the mean value of each 200 data or every 100ms (Not moving mehtod. similar like method one in attched pic). And then, I need to have moving average (this is moving averrage as shown method 2 in the pic) for each 15 consecutive mean values gotten from last step. Rate transition block can not be used since the whole model is used for a controller with a function call. Do you have other suggestions?

Thanks