Should I change clubs with my flatter swing

So now that my swing is getting flatter, should I consider changing clubs.

My current set Muzino jpx ez bent 2 degrees up, with my new swing, what part ball flight is my mistake vs the bent upright of the club? I think mentally when tom changes my swing i see the ball flight go awry and i stop doing what tom is trying to make me do.

I have always used game improvement irons, I swing the same length clubs from 8 iron to 5 iron due to my old upright swing, i think i will keep the club length the same with my new set. I hit my 8 iron 145 pretty consistent. I have never had a handicap I think its BS, before Saguto I shot 90, 8 out of 10 times. after a month following Tom i have shot 3 rounds in the 80s in the last week. I play a lot of golf 4 to 5 times a week, so im getting better. today 9 holes 2 birdies 2 pars 5 bogies so im getting better and think i may move up to a ping I500 or similar. when do you make the leap from game improvement iron to the next iron to help you play better golf? or is the whole golf iron choice BS?