Bootstrapped Transimpedance Amplifier (TIA) - High Frequency Instability
I'm not 100% convinced the OPA657 can produce great results when it is operated using a bootstrap circuit as you have. The bootstrap performs one primary function and that is to "convince" the TIA circuit that the photodiode self-capacitance is much smaller.

Having a smaller photodiode capacitance means that noise-gain is significantly reduced and you can "afford" to reduce the feedback capacitor in order to get more bandwidth. However, the OPA657 is compensated internally for gains of ten and this means at gains of near unity it could become unstable or show signs of excessive noise. Consider this section of the data sheet: -



This is for a conventional un-bootstrapped TIA and although you may think it to be unity gain, it isn't. The "true" gain at high frequencies is roughly 49 pF / 0.55 pF = 90. I'm not talking about Vo/Iin here - I'm talking about noise gain and the noise gain is about 90 at high frequencies. However, this is pegged-back by the open loop gain characteristic to about 8 (see figure 9.2.3).

In other words it has a gain of round about ten i.e. the point that the internal compensation is optimized for.

Bottom line is that I'm pointing at this and saying that this op-amp is not suited for use as a bootstrapped TIA but there could be other reasons such as poor decoupling on the supply rails, bad PCB layout etc..