Amplitude depends on capacitance (and inductance) ratios too, you have play with them. Or on bias, you have set almost half of the supply voltage on Q2 emitter, wasted the supply voltage a bit. Hard to say exact answer, there are more elements compared to usual Colpitts oscillator, I don't see why those are useful. With a simple colpitts it is possible to reach Vcc amplitude oscillation with suitable device values and transistor.
And please share a bit more info, like node waveforms, Cprobe value, max consumption, max distortion, etc. It would be easier to suggest the best solution.