There really isn't any reason to change the I&R arty (fun fact, it is basically the same exact strike as the 155MM in the WC51, which nobody is complaining about.) For the munition it costs, you're just not going to see it early game, and even if you did, it's not nearly as amazing as this thread seems to make it out to be. Locking it behind Major is unnecessary as well as counter-intuitive given the very description of the unit being "authorized to call down artillery strikes".
I can understand Recon Support is a bit buff at the moment, but it definitely isn't because of the I&R arty.
Funny that you mention WC51, because guess what:
155mm Artillery Barrage
Drops a 155mm artillery barrage into the target area.
Requires Major
Costs 180 munitions
Both abilities require the player to have the Mechanized Commander locked in
And if remember correctly they different abilities. As far as I can remember IR&P has less shell but drop faster and causes engine damage.
So as I suggested make cheaper but less lethal or lock it behind Major.
140mu to kill one mg is is quite expensive in early game but I can accept that because how usefull this ability is in late game.
It would be nice if they nerf grayhound a little bit and put him in cp3 or after full officer tech because right now its too late in 4v4 mode
That is part of the problem it is very expensive to kill a HMG that might actually be able to retreat.
On the other hand in a 1v1 mode killing an enemy ATG when one's light vehicle is out can be crippling to the opponent and ATG can not dodge the ability.