From the description the config doesn't sound that bad. The only thing I notice is that you have very little spinning media per CPG. If I were to start from scratch I would have only one FC CPG with more drives to get more performance.
If you get performance issue at T2 during migration, it sounds like there is a config issue. T1 should be base CPG and this is where you should get issues at migration if you get any.
Ao without SSD at all sounds like a bad call, but you could limit it to a few TB if you want to use some SSD for dedupe/compression. For DECO I would suggest that you ensure you have a 3PAR model optimized for flash (8440..or any xx40) but I have a feeling that you're stuck with a 8200 based on the SSD/HDD combo.
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