Build a gallery which show only the Tasks for Active Projects + Assigned to the login user

I have these 3 SharePoint lists:-

1) Project, with these fields:-

- ID

- Title

- Description

- Status (Active,Completed)

2) Task, with these fields:-

- ID

- Title

- Description

- ProjectID which store the Project's ID inside a number field

3) TaskPeople

- ID

- People. which is a people/group field which allow single selection

- TaskID which store the Task's ID inside a number field

Now i want to build a gallery which shown the Tasks as follow:-

1) Define the Gallery Items property to only show Tasks that are : -

- Assigned to the login user

- Under an Active project.

2) Also inside each gallery Task item, to show the related Project Title

Now i am unable to write a formula which achieve my requirement without getting delegation warning. can  anyone advice? Also as this gallery is very important to us, and we might add some filtering drop-downs to it.  Regarding the size of this system, we might have 500++ projects, where under each project we might have 2K-3K tasks , and for each task we might have up-to 3 people assigned to the task.. so if i can not achieve this requirements using SharePoint lists, is it better to use SQL server tables?