This is the method i use it works for me to get the 25%+ score most of the time. On the first node i hit Sharp vision 3 and put the 57%~ option to 100% mine all 6 of them. From then on I use sharp vision 2 on each node. This allows me to gather 5 of the 80%~ items at 95%~ . After 5 successful attempts in a row use Deep Vigor to raise items to 100% and use the last one to get the highest level item. This gets me well over the 25%. If you have to lose a little of the time bonus to make sure you have enough GP to get the 25% bonus it's more than worth it. I normally finish with 15-16 minutes remaining on the timer. this works for the 8 node levequest.

For the 4 node i have to eat some time but i use Sharp vision 3 on the first 2 nodes and collect the highest level items. Then regen some GP and collect the rest using the sharp vision 2 method. I'm usually able to complete the 4 node leve with 16-17 minutes remaining. I hope this was helpful in some way.