"Never attribute to malice that which is adequately explained by stupidity."
I think in this case it's probably more like apathy, but in any case the result is that IMHO you should take charge of getting the checkride scheduled with a DPE and not expect your CFI to take care of everything. There's nothing preventing you from contacting a DPE and scheduling it directly yourself. However many CFIs and flight clubs have preferred DPEs so you should at least ask your CFI which DPE(s) they like to work with and then you could contact them directly.
It seems like half of what you learn in pilot training is that you're in charge and need to be responsible for everything required to safely complete a flight. It took a while to wean myself of the CFI sitting next to me on every flight telling me what to do (or at least being there to answer if I asked what to do). The same thing should apply when it comes to responsibility for scheduling your checkride. I had to schedule mine a couple months in advance but it only took a couple days to actually put down a deposit and lock in a date. I also reserved the date before I was actually ready for it because I knew there would be a delay (good DPEs around here are pretty busy). Now I just need to finish training before then and actually pass it
Congrats on being ready in so few hours though. I'm going for the record for the greatest number of hours before the checkride
I've managed to hit almost everything that can slow the process down... switching planes (Cessna to Cirrus), instructors, flight schools, problems scheduling more than one lesson per week for a while, injury that grounded me for two months, huge delay getting my medical certificate, and just plain old being slow to pick up some of the stick and rudder skills.