That was already done ~2 years ago (IIRC?) to make teching to T4 easier. Right now there's not really anything left to adjust beyond that, without messing with T3 and T4 timings.
Since that time the Panther became more expensive and got the Vet2 HP at vet0 but less armor overall and the Brumbar got nerfed, so it is a bit harder to get the impact out of t4. Also the entire light vehicle rework came after that IIRC, so there is a different 1v1 meta at this time which encourages producing something quickly to counter an aaht, stuart, t70, aec ect.
If you had total Lattitude you could just make All the Units come out of a "T3" building and make the upgrade to BP3 to unlock "T4 units" cost 60 manpower and 35 fuel.
Both T3 and T4 timings would be the same and It would be easier to get both.
The other option would be to make t3, and BP3 Cost less but add that cost back onto BP2. Again Same timings, Just easier to sidetech, but It would only be equivalent to the prior option if you make t3 cost nothing.
Edit: Also For comparison 200mp and 50 fuel is what UKF pay to get Warspeed, Gammon bombs, FOW tracking AND comet unlock, so I think it's fair to say 200mp and 50 fuel is overpriced.
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