Shortening shafts back to standard length

I ordered a set of Forgan 150 steel irons from Forgan St Andrews. As a fitter in a golf shop (static fitting, no stance or swing checked) had told me that I should have half an inch longer clubs, I made use of the offer of Forgan company to order the set of irons with half an inch longer shafts -  they let you choose different specs including lie. Now I clearly see, given my stance checked by a pro, that they are not only half an inch too long, but the lie is off, too. I am sorry I followed the opinion of the shop fitter and I should have probably ordered the standard length. Now if I have these irons shortened back to standard length, will they return to their original standard swingweight? I suppose when you order longer irons, they come with lighter swingweight, at least at Forgan they don't mention compansating for swingweight when adding length to shafts. Although I am not  a very advanced player, I think based on my height, arm length and mainly my stance I don't want to play with clubs that would be too long or that have a lie that is too off. Even if I choke down half an inch, the lie angle is still pretty off and I don't like the feel of clubs too long.  Thank you for helping me get this right.

Thank you for replying. The company doesn't offer swing weight adjustments and I don't know what the standard length swingweight is. I looked for anwers on google about what happens if a club is longer than standard and extenstions etc and it all sounds like the swingweight is different, so what the company probably does, they add extension or just use longer shafts without adjusting the swingweight. Originally, I just thought half an inch longer would be a good idea only to find at home comparing with my old standard clubs, that the new clubs feel odd, the swingweight is different, the length is too much, even a pro teacher told me the clubs are half an inch too long, but advised me to choke down the different lengt, which to me is not exactly what I want, just not the right feeling for me. If I choke down, it's because I want to and not because the clubs are too long.  So now I want to go back and have the standard weight and standard swingweight. I am going to a pro fitting shop. I will ask to check the lie, too but basically, if the length is back to standard, I think the lie will be OK.

Thank you, I will do that. They'll feel better and probably the right length anyway.