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Unfortunately I'm back here. I thought it would be all joy and fun with the simpler series topology (within its limitations) but I found sth else that I don't know how to deal with.
I attach the TF of this last circuit, and as you can see, there is a peak at approx 240 MHz (and 500Mhz??) that always includes a HF component in my real output. It doesn't seem to be affected by the compensation capacitor (which should avoid any oscillation, as well as reducing the bandwidth, when it's relatively high) and there is no information about high frequency (f>100MHz) behaviour (output impedance...) in the LMH6624's datasheet.
As a comment, I don't think it's created by some combination of the two OpAmps, since I can see it as well when I have just one stage/one output (single OpAmp - LMH6624)...
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