Here's some numbers to chew on.
At an assumed 4.25 nodes per captured planet, a player has 72 nodes at 15 planets.
At this point, the current M&C gross value per second is:
Logistics Stations; 2,774.
Econ 1's: 3,030 (9% Increase)
Econ 3: 5,169 (86% Increase over Logistics, 70% increase over Econ 1)
Harvester 3: 6,846 (146% Increase over Logistics, 125% Increase over Econ 1)
Econ 3 & Harvester 3: 8,985 (223% Increase over Logistics)
Ok, so if the Econ 3's are currently "balanced" and if the goal is to get parity at around planet 15, then the Harvester 3's produce an excess 1,677 M&C over 72 Harvesters - or 23.29 per harvester.
73 - 23 = 50.
At an assumed 4 nodes per planet, You get 68.5 nodes. (12.5 for the Homeworld)
.. repeat Math process, end up with a 1,492 gap/68.5 Nodes and a calculation of 73-22 = 51.
At an assumed 4.5 nodes per captured planet, you get 75.5 nodes.
.. repeat Math Process, end up with a gap of 1863/75.5 nodes and a calculation of 73-25=48.
To get to a 44 value you need to assume 5.5 nodes per captured planet.