You did not mention your plumbing. What does the pool builder want to put in and what do you want? Lines sizes, number lines, returns, skimmers, main drains, etc. Also, how far from pool to pad.
Your pool size is pretty close to mine and I have two skimmers, a split main drain and 4 returns.
Ideally, I would have each skimmer and the main drain pair on a separate 2" lines all the way back to the pad. 3, 2" lines are equilvalent to a single 3" line plus it will allow you to turn on just one of the three to isolate a suction line for repair or to drain the pool via the main drain only.
For the returns, you could go with one 2.5" line, two 2" lines or four 1.5" lines. Each configuration is equilvalent in terms of head loss. If the pad is close to the pool, you could go with 1, 2" or 2, 1.5" lines.
This should give you pretty close balance between suction and return. Adding ball valves at the pad to control flow will allow you to fine tune your flow rates.
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