Although i am a competitive pve player (t5 - t10 most of the times), i can definitely say that i am not having a lot of fun with how things work at the time.
In order to maintain my position at top 10 i have to play specific times every day, using the same teams over and over again. This is stressful and it keeps me away from the time i can spend with my family.
Also its a little bit unfair for most of the players that cant do the same.
Suggestion:
Make every node playable 10 times.
For every 2 clears give a reward and raise the difficulty of it.
First 2 clears should be easy enough for people with 1* roster.
Next 2 clears easy enough for 2* rosters (the 3 one can be done with boosted 1* roster)
Next 2 clears can be done with 3* roster (the 5 one can be done with boosted 2*)
Next 2 clears for people with 4* roster (the 6 one can be cleared with boosted 3*)
Next 2 clears for 5* rosters (the 9 one with boosted 4*)
Pros:
- Remove time anxiety
- Awards long time players and gives a motive for transactions from one tier to another
- Let people experiment with different heroes
- Easier to have a normal life, you just play when you can
- If scaling is good and matches are difficult but doable, we will use more health packs
- Prizes depends on your rosters progression
- People with have a motive to level up their under covered 4* and 5* (meaning more chances to buy something)
Cons:
Devs need to do a lot of work 
AWARDS:
First clear - random boost
Second clear - standard token
Third clear - 140 iso
Fourth clear - 250 iso
Fifth clear - 500 iso
Sixth clear - elite token
Seventh clear - 250 iso
Eighth clear - heroic token
Ninth clear - 500 iso
Final clear - 1 cp
This will also give more iso to players with big rosters who need it the most and a motive to play daily pve
OVERALL PROGRESSION REWARDS
Things can stay almost the same just with few adjustments
In order to get the 4* character you need to do 6 clears (meaning with a 3* roster only)
The 15 cp reward comes up after 7 clears (meaning those with boosted 3* or just with a 4* roster)
PLACEMENT REWARDS
This need to change.
Everyone who can make 10 clears (5* roster), is awarded with a specific 4* (all colors), an LT and tokens from events vault
People with 9 clears (boosted 4*) a specific 4* (2 colors) and tokens from events vault
8 clears (boosted 3* and 4*) a specific 4* (1 color) and tokens from events vault
And so on
I am pretty sure none of all this will ever happen but i had some free time and wanted to give it a try 