hi hi all,
honestly, is not easy to play a low trajectory on most iron, a Mid trajectory is more likely to happen.
Firstly, do check your loft angle first, get abit stronger to get it lower.
Secondly, get ur flex just abit stiffer but not heavier.
Thirdly, trap the ball more instead of scooping.
Do see ur Golf pro for advise.
There is a new Project X shaft call PXI = about 100g to 105 g
comes in 5.0, 5.5 and 6.0.
Pretty good shaft that can keep ur trajectory down.
Hope this help.