spacing of invisible rests

[Jaime Oliver]

Hi all, 

I am trying to control the amount of space that s events take on each bar so that I can make some bars longer. Is there a way I can specify this? Also, some bars which have values like R1 are also really short, how can I make those longer? 

In other words, is there a way to make bars visually longer even if they show empty space?

I have tried things like the one below but have not had good results

\layout{

   \context {
        \Score
                  proportionalNotationDuration = #(ly:make-moment 1/32)
                  \override SpacingSpanner.base-shortest-duration = #(ly:make-moment 1/32)
                  \override SpacingSpanner.uniform-stretching = ##t

I am also attaching a screenshot so you can see the kinds of results I am getting.

All the best,

Jaime