What is the way to Complete 5.2.6 with 4 stars?

Before I post this discussion, I would like to clarify that I am not doubting anyone's abilities and skills in this game and I have seen people become uncollected by just using 4 stars. The reason I put forward this question is because I've tried to do it with 4 stars but by the time I get through first few enemies my team gets KOed. And since I have to fight the collector boss in the end my question is should I wait to get a decent 5 star or should I push through this using revives/ potions or really improve my skills and then try it. Any suggestions/ tips are greatly appreciated. I am not a skilled player so I thought I should ask people who are.
Thank you.
Thank you.
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I am one fight away from collector and I am using 2 5* at R4 and the rest are 5/50. And I feel that IN MY HANDS, 5/50s begin to have a really hard time in Act 5. The 2 R4s are incredible though and do all the work. They make all the difference.
And finally, make sure you have a few good boosts on when you try hard content. It's easily forgotten but it does make a big difference.
I probably ran the path 20 times before I got to collector with min 3 champs at full health. Then its a matter of resources...
4r5 Quake
5r2 Quake
4r4 duped void
4r5 unduped Sparky
4r5 Duped Hulk.