IX Dra is not a period bouncer but sits with ER Uma and V1159 Ori on the upper branch of the evolutionary curve.
I have started a short note for the next VSSC describing the topic.
As an aside, the position of DI Uma on the graph is curious as the absence of RZ Lmi (its twin) on the graph. DI Uma seems to have a solid orbital period and yet its “twin” RZ Lmi has not revealed its orbital period “as it is usually in outburst”. I am wondering if the orbital period for DI Uma is wrong. I think only time resolved Doppler spectroscopy has a chance as the TESS coverage is poor and noisy.
DI Uma is not well observed and is also close to a standard star. Because it is very active (half the time in superoutburst) only very regular observations actually show the light curve clearly.
Stewart