How do NL starting pitchers fare coming to AL mid-season since 2011?

Now that Red Sox have traded for Drew Pomeranz, what should the expectations be for a starting pitcher coming from the NL to the AL season mid-season.

I went back to 2011 to see which starting pitchers moved form the NL to the AL during the year.

First the combined results of the 10 pitchers that moved form the AL to NL.

ERA rose more than 0.60, WHIP increased by 0.06..

LG	W	L	W-L%	GS	IP	H	HR	BB	SO	ERA	WHIP
NL	60	69	0.465	181	1121.2	1,039	120	337	1,005	3.67	1.23
AL	43	38	0.531	110	699	699	82	206	590	4.27	1.29

Now the detail of each starting pitcher.

NAME	AGE	YEAR	TM	LG	W	L	W-L%	GS	IP	H	HR	BB	SO	ERA	WHIP
Cueto	29	2015	CIN	NL	7	6	0.538	19	130.2	93	11	29	120	2.62	0.93
Cueto	29	2015	KCR	AL	4	7	0.364	13	81.1	101	10	17	56	4.76	1.45
Fiers	30	2015	MIL	NL	5	9	0.357	21	118	117	14	43	121	3.89	1.36
Fiers	30	2015	HOU	AL	2	1	0.667	9	62.1	45	10	21	59	3.32	1.06
Hamels	31	2015	PHI	NL	6	7	0.462	20	128.2	113	12	39	137	3.64	1.18
Hamels	31	2015	TEX	AL	7	1	0.875	12	83.2	77	10	23	78	3.66	1.20
Feldman	30	2013	CHC	NL	7	6	0.538	15	91	79	10	25	67	3.46	1.14
Feldman	30	2013	BAL	AL	5	6	0.455	15	90.2	80	9	31	65	4.27	1.22
Garza	29	2013	CHC	NL	6	1	0.857	11	71	61	8	20	62	3.17	1.14
Garza	29	2013	TEX	AL	4	5	0.444	13	84.1	89	12	22	74	4.38	1.32
Happ	29	2012	HOU	NL	7	9	0.438	18	104.1	112	17	39	98	4.83	1.45
Happ	29	2012	TOR	AL	3	2	0.600	6	40.1	35	2	17	46	4.69	1.29
Dempster	35	2012	CHC	NL	5	5	0.500	16	104	81	9	27	83	2.25	1.04
Dempster	35	2012	TEX	AL	7	3	0.700	12	69	74	10	25	70	5.09	1.44
Saunders	31	2012	ARI	NL	6	10	0.375	21	130	146	17	31	89	4.22	1.36
Saunders	31	2012	BAL	AL	3	3	0.500	7	44.2	49	4	8	23	3.63	1.28
Sanchez	28	2012	MIA	NL	5	7	0.417	19	121	119	12	33	110	3.94	1.26
Sanchez	28	2012	DET	AL	4	6	0.400	12	74.2	81	8	15	57	3.74	1.29
Jimenez	27	2011	COL	NL	6	9	0.400	21	123	118	10	51	118	4.46	1.37
Jimenez	27	2011	CLE	AL	4	4	0.500	11	68	68	7	27	62	5.10	1.45