The 4 iron is std at 38.5 inches, the 7 iron is std at 37.5 inches. I assume your irons will all be +1.5 inches over std. Unless you are also standing more upright due to a physical limitation, you probably won’t do well with a longer iron. The length should be set by how you stand and wrist to floor distance. Standing further back will be a flatter swing and doubtful the lie could be adjusted that much (lie adjustments should be limited to +/- 2 degrees to keep surface from cracking). A flatter swing may result in not getting enough launch angle for max distance, as well as affect dispersion.

My only expertise is being 70 as well. I have gone with the 45-50 Fubuki MV shaft and it was a huge improvement over NP 950 metal. Weight is one consideration - the feel was preferable to the Tensai Red in the same weight range.

Others with more experience in this area may have better advice but you may want to experiment with a club maker or fitter to optimize the length and lie with you for the first club.

Yes the lie can be changed, 2 degrees up or down from they’re at now. What club did the fitter suggest a 40” shaft for? If you are adding length to them there will definitely be an adjustment period, longer the shaft the harder the center is to find. Length doesn’t always add distance as much as the correct flex. Just my experience with building clubs and fitting.

AP1- 716