Trying to recreate a colour blend within a text - stumped.

[puw]

I am trying to replicate a fill within a text that has 3 colours, image one is the original.

Image 2 is the best I've got up to now, but I'm still a long way off understanding how to blend, control the colours to only 3 and make the band thickness's as can be seen.

What I am doing is:

1 - creating an oblong shape and duplicating (the blend tool seems only to work with 2 - I initially tried/had 5; red, orange, yellow, pale yellow, green)
2 - one shape is red, the other green
3 - select and blend, increase the steps, select rainbow, use position and attribute profiles to try and fine tune/position etc
4 - create a bitmap copy
5 - select text, select fill tool, select bitmap, select copy from 4 above

I have tried different heights/thickness's of the oblongs.
I have tried adding space between them, to see how that affects the end result.
I have tried manoeuvring the right angled arrows but this always has a negative effect

The blend in image 2 introduces orange which I don't want and the yellow middle is not high/thick enough. Only the green looks nearly right.

How can I easily control the colours required and their thickness's please?

Perhaps I am using the wrong tool or perhaps another program deals with this better?

Thanks you in advance for your help.