Did you keep your whole team position for all stages? Or did you finish the fight with your ninjas being serious damaged?
Survival trial AI is dumb, they will keep doing the same thing over again so all you need is to counter it with your position, talent and tactis. When the fight go wrong and your ninja take too much damage, hit retreat and rethink your strategy. Your goal will be pass all the stages with minium hp lost before 11, 12th stage.

Few tips I can give you :
1. If they use Sasuke, let him cast his barrier because most people put Sasuke behind and he is very squishy so it's super ez for you to kill him in round 2 before he can hit kirin.
2. Neji is your best friend when enemy is faster than you.
3. If enemy use Guy, 100% Guy will use his mystery in 2nd so target both him and any ninja with 20 chakra mystery on round 2.
4. Try to use Shika, Ino, Naruto, Kakashi to do survival. That team need a bit of practice, but when you know how to use it and know your enemy, it's easy to pass survival or at least it will help you go to 11th stage without have to use ur main team.

Can you show me what this lineup would look like

Some tips...
1. It's good idea to run away if RNG screws you over, like if one of the enemy ninjas starts a combo on your ninja or you fail to evade an attack. Also you might want to run away before the 10th round completes else you lose your whole team, even if you win.

2. If you know you can defeat the opposing enemy easily, you c*e that fight to recover some health with a healer like Kabuto. Else just keep positioning and changing ninjas to try different combinations until you win, because ninjas don't lock in until they complete one fight.

3. Combo starters and damage soakers like Naruto, Kankuro, and GNW Kiba are pretty useful because you can have their puppet/clones take hits while having them start a combo on the first round. Kankuro's poison and his GNW's Ignite is really helpful in taking down opponents whose team is built with stall in mind(ex. earth mains).

4. Although not extremely useful for PVP, ninjas like Shika, Ino, Shino, etc are useful in Survival Trial against AI controlled teams. Since AI is predictable, you can trial and error your way to victory.

Being higher level should make survival trial easier, because the more difficult enemies should start appearing in "Trial Breakthrough." You might want to unlock Fire main as he helps a lot if your F2P, in sleeping and immobilizing enemy units. After your first few complete clears, it should get way easier as you can sweep most of Survival Trial.

Actually it gets easier, some people even thought it got nerfed, but they might have derpy level formula. I remember in early days of sever my 11th and 12th node were always stronger then me and i had to try, now i don't think i met someone with more power then me in past 2+ months. Not sure if it was caused by patch or hitting level 70~ ish but i wasn't only one who got this, people in my group noticed it as well so i guess it happens to all.

It should look like this, but position can be change depend on enemy team

bad, u not know about initiative

How can someone who don't know about initiative rank 6 and never fail survival since server started? Also the reason I'm rank 6 is because I didn't online for 2 days, that's why the top player are 24 stages ahead of me.