I'm just curious and wondering if I should have done a longer tech phase.....maybe to 150k before converting? I haven't played casher in a long time and i was never any good at it.
In my opinion it very much depends on how fast you are going to grow and how much defense you need to keep to protect your land. If you are only growing at explore rates you will be able to keep up and increase your tech while growing. If you are growing faster as a % of your total land it will be more difficult to keep up your tech rates.
The other factor is defense. I made the mistake in primary this set of not teching long enough and then growing too fast out of the gate and not being able to keep up with Defense, Offense and Tech at the same time. Because R/C require the most tech per acre in the early phase when you can explore 25+ acres per turn you would need to be able to buy something like 750 tech pts per turn to maintain a healthy revenue per acre. I haven't built a spreadsheet for it but there is probably a sweet spot where the growth % of acreage allows for adequate investment in tech and military. I hope this makes sense.