12 weeks of deca & 14 weeks of test is way too long.

You will stop seeing results/gains off this combo right around week 6-7. 9 weeks of deca and 11 weeks of test is just right. You will be doing your balls & your body no justice taking anything longer than 9 or 10 weeks of deca. Deca is very potent and you'll just be doing yourself more harm.

I would run HCG throughout the cycle every Monday & Thursday at 25o iu to prevent shrinkage. You know what they say... It's better to prevent than to recover from shrinkage.