Fit text in bar chart and change bar colors

Hi Everyone,

I have this timeline chart of different failures that affected the performance of a car, I made the chart using PeltierTech's "Easier gantt chart for repeated tasks". There are three places where failures happen so I grouped them with colors (see image), but in order to make the chart easier to understand I want to paint the bars with the according colors and not use boxes. Note that the grey boxes are only to make spaces and separate the grouped failures, is there a way to use 3 sets of data for this? I can't mannually paint them since the failures change weekly and I'd have to repaint manually every week.

Also, there are labels in the bars that help my find out about what type of failure happened, but they don't always fit the length of the bar and I really don't want to make the text smaller, does anyone know how to help me with fiiting the text?

Also I'd like to add informative vertical axis labels according to PeltierTech, but can't do it since I've already used my secondary axis.

If anyone knows how to attack any of this issues please let me know.

Thanks,

Felipe.