How can I use same video in two menus without increasing size of DVD?

I have a DVD project with 5 videos in it and have a main menu and chapter menu. In the main menu - I have three buttons - "Play" "Chapters" & "Languages" (for subtitles). In selecting the "Play" - I have it set so that it will play the first video then jump to the second and onwards to the last video-by selecting the next video in order in the end jump.

When you select "Chapters" - it goes to a Chapter Menu and in this menu there are 5 buttons / thumbnails of each individual video and from here I want each video after it finishes to jump back to the Chapter Menu.

SO what I did was duplicate each of the 5 tracks / videos and renamed them and had each of the tracks within the Chapter Menu end jump back to the Chapter Menu.

However, when I duplicate the tracks it also increases the size of the DVD so that it exceeds 4.7 GB. My quick fix on this was to encode / compress the video files at 150 mins instead of 90 minutes - but this will decrease the video quality as well.

So how can I set this up so that the 5 videos play consecutively when I press the "Play" button in the Main Menu but in the Chapters Menu, the individual videos end jump to the Chapters Menu - without having to duplicate the tracks and / or increasing the size of the DVD?

I appreciate any help and advice with this...