Using a center tapped balun at Tx outputs would eliminate the chokes resulting in a lower component count, area and cleaner layout. This approach is recommended (especially at higher frequencies).
For Tx, the output port impedance is 50ohms differentially and the required balun is 50/50 (provided that the load is 50ohms too). The differential lines as well as the single ended line need to have 50ohm characteristic impedance.
For Rx, the recommended balun is 50/200. In this case the differential line impedance needs to be designed for 200ohms and the single ended transmission line needs to be 50ohms.
ATC 10pF capacitors seem to be very large (physical size). You need to pay attention to parasitic capacitance introduced by capacitor pads to ground. I would suggest using smaller capacitors.