Still thinking about that Soviet Mechanised Corp list

I am still pondering that Soviet Mechanised Corps list for mid war 1943 Spearhead games. The earlier list is tank heavy, and that's certainly a valid option. But I am wondering about the balance. So here's another iteration, removing one of the Tank Brigades, and replacing it with a slightly slimmed down mechanised brigade. This brings a little more balance with enough infantry to suppport the armour, while retaining the Tank Regiment from the Mechanised Brigade assets. I am wondering if the earlier list is in fact legitimate, since that Tank Regiment with the Heavy tank Companies is in  fact an asset for the Mechanised Brigade, and the earlier list had none of the Mechanised Brigade's core fighting units.

Here is the amended list. Remember that this is the on-table elements only. This is 'stiffened' with off table artillery, and counter battery support (yes, I never go anywhere without it).

Russian Mechanised Corps 1943: Attack List
				Quantity	Points Cost	Total	Morale	Number of stands	Modified Total
	Core Troops
		Corps HQ
			T34/76C	1		20		1	18
		1st Tank  Brigade consisting of:
		1st Tank Brigade HQ:					Regular	1
			HQ BA32	1	6	6
			Total			6			5.4
		Tank Battalion					Regular	8
			T34/76C	4	20	80
		Tank Battalion
			T34/76 C	2	20	40
			T70	2	9	18
			Total			138			124.2
		Motorized Rifle Battalion consisting of:					Regular	13
			Battalion HQ in Jeep	1	6	6
			Rifle Stands in Trucks	6	5	30
			SMG Co	3	6	18
			81mm Mortar & truck	1	6	6
			HMG Co in Truck	1	3	3
			45/66 ATG & truck	0	5	0
			Total	1	7	7
						70			63
		Brigade AA Battery
			37/70 AA Gun	0	5	0
			Quad MG truck	2	5	10
						10			9
		Rifle Regiment
		Regiment HQ:					Regular	1
			HQ Stand&Truck	1	5	5
			Mortar Co 120mm Mortar&Truck	1	6	6
			Total			11			9.9
		Infantry Battalion consisting of:					Regular	12
			Battalion HQ	1	5	5
			Rifle Stands	9	5	45
			HMG	1	5	5
			Mortar Co 81mm	1	3	3
			Total			58			52.2
		Infantry Battalion consisting of:					Regular	12
			Battalion HQ	1	5	5
			Rifle Stands	9	5	45
			HMG	1	5	5
			Mortar Co 81mm	1	3	3
			Total			58			52.2
		Infantry Battalion consisting of:					Regular	12
			Battalion HQ	1	5	5
			Rifle Stands	9	5	45
			HMG	1	5	5
			Mortar Co 81mm	1	3	3
			Total			58			52.2
		Tank Regiment
			HQ T3476C	1	20	20
			Heavy Tank Co KV1C	2	23	46
			Tank Coys T34/76C	3	20	60
						126			113.4
		Light SP Gun Regt
			SU76s	4	13	52			46.8