If putting is an issue you can try two putters in the bag. I have a couple of putters and I have brought two more than a few times. I have one that is great for slow greens and one that is great for fast greens and one that is good on almost anything... so sometimes I bring both the great ones instead of the good one.
Yes the center of gravity is a little lower compared to the MP-4's and the topline is a little thicker to "hide" the thicker muscle. They are basically between a Mizuno classic blade and a player's cavity back (MP-64). Shape of the muscle and channeling can make a difference but overall performance is going to be similar. If you want a blade looking iron with forgiveness the i blades are the best way to go. Blades will never be obsolete because good players like playing them and they look cool. You'll probably see more "tech blades" like the PXG and Titleist T-MB irons.
@JxQx I have the MP-4s and they are money! The MP-5s I haven't hit before but I'm sure they are the same, Mizuno knows how to make a forged iron. I hit the Titleist the day I got the 4s and they felt good, but not like the Mizunos.
I haven't felt that way about golf yet. However, I can relate as I had that same issue with tennis.
I was a scholarship tennis player and tennis instructor. I got so competitive that winning wasn't that much fun due to pressure and when I did lose a match it was awful. It always felt like a high pressure job after I graduated high school.
Then I discovered golf playing Tiger Woods video game. This wonderful sport is only as competitive as you want to make it. You can play higher pressure stroke play events and betting games with other players, or choose the low stress route of "playing against the course" and playing in scrambles only.
No matter how low my handicap gets I will never play another stroke play event. The last one I played in I shot 3 rounds in the low 80's and lost to a guy that couldn't break 90 due to his "handicap." I said to hell with that...and I've stuck to scrambles and playing the course ever since.
The 3h seems like a waste of a slot (distance-wise). If it was me, I'd ditch that one in favor of something that I could hit 205 to better fill the gap between the 3i and the driver, and get another wedge for around the green as well.