Yes, you have violation(s).
#12 wire may be protected by not more than 20A. For 30A you must use #10AWG minimum. These ratings have been in table 310-16 for many code cycles and supercede any ampere ratings listed in the temperature columns.
Remember the tap rule is the total length of the conductors not the physical seperation of the devices.
Also how did you make the tap? It is a violation to put multiple conductors into a single lug (unless the lug is listed for that combination).
