After looking at the roster and seeing the extensions feel you kind have to invest in the core and complement the Js to the upmost. For me that's...
Starters
PP, Smart, Brown, Tatum, Horford
Starters that have space and set the tone should help for good starts. PP and Horford allow the Js more freedom to operate. Smart helps out with any tough covers 1-3. The passing and ball movement should be way up as the experience is high.
Main Bench Options
PG, Schro for playmaking and defense.
SG/SF, Nesmith for more shooting/spacing and offball plays.
SG/SF, Richardson for better defense and switchablility.
PF/SF, Parker for flexable big that can still cover wings.
C, TL for a defensive anchor and playmaking against elite bigs .
Unit approach / main 9 man rotation
Like the idea of Schro, Rich, Nesmith, and TL as a unit for PP, Smart, Tatum, and Horford in early substitution. Playmaking, defense and shooting shifts positions and though the skills are at a slightly lower level the skills remain available. This would some what create a small ball team with Brown playing the 4 for a few minutes and most the guys on the floor all able to push the pace and cut. Lineup: Schro, Rich, Nesmith, Brown, TL.
Tatum and Smart come back in for Richardson and Brown. Giving Tatum a more quick strike role off the ball for a few minutes. This should prime Tatum to catch fire with more guys on defense and focused on playing making feeding him. Lineup: Schro, Smart, Nesmith, Tatum, TL.
Next substitute would be Brown, Horford and PP back in for Schro, Nesmith and TL. Returning to the starting lineup. Completes the main 9 man rotation plan.