Some of your components (like 3.7 nH coil) are a bit unrealistic at 145 MHz. The unload Q will be bad. The PCB short transmission lines at 145 MHz are pretty much just contributing additional stray capacitance to ground, the most damaging being the 0.7 pF or so PCB stray to ground between your series 1.8 pF/644 nH coupling resonators. If you design for higher termination impedance you will get more realistic component values.
14% bandwidth is achievable with just capacitance top coupled parallel tanks. It is near the limit but do-able.
Your model does not include effects of Q of components, primarily the coils, which will change the design quite a bit. A tank with 3.7 nH and 325 pF resonanting capacitance will have a very low unloaded Q, probably in range of 20 to 25. Probably below the minimum necessary to make the five pole filter design.