Your observations and comments are incorrect. I use 66-68mm figures with 1/25 scale armor and artillery because they are far more realistic than 66-68mm figures with 1/30 scale armor where the heads are above the 6 foot high panzers deck. The only companies producing size compatable products i.e. figures, armor and artillery; are First Legion and TCS. One produces true 1/30 scale and the other produces 1/28 scale products. I do not demand complete scale compatability; as you erroniously assert. I collect 1/25 scale armor and artillery that requires 70mm figures to be perfectly scale compatable. I find that 68mm figures by TCS, K&C and TG work well and are within the norms of human height variability and proportion. I also collect armor in many scales where my standards are more stringent i.e. 1/72, 1/50, 1/35, 1/32, 1/30, 1/28, 1/25, 1/24, 1/18 and 1/16.
I posted the photo so others who collect vintage artillery i.e. Hausser, Lineol and Marklin; could benifit from my experience using the larger size figures available from TCS, K&C and TG. I appreciate well intended criticism. I despise disparagement!