I feel for you. Pan F is one of the most difficult (and often as not frustrating) black-and-white films ever made, to work with. Its exposure latitude is quite poor, highlights blow out, careless developing produces results best described as Soot And Whitewash. And what's even worse, your exposed images start to deteriorate almost immediately after you make them, so you have to process asap or lose quality.
For all that, I use a fair lot of it. Over the years I've worked out the exposing and processing techniques that best suits me, not an easy task given the harsh Australian light I often shoot in. This is entirely too difficult to explain in one thread, but suffices to say that the best you can do with your 'mixed' ISO rated film is simple - decide which of the two lots of images are most important to you, develop accordingly, and sacrifice the rest. This is the KISS technique, and also the easiest. Sad about the images you lost, but, well, how much of your work can't be retaken anyway?? If you shot landscapes at one ISO and personal images (family, pets, home etcetera) at the other ISO, then for me the solution to this is easy - process for the personal images and go back and reshoot the pretty scenery.
As for processing - too much development give you dark grey negatives. Too little give you light greys, which surprisingly scan very well. Hitting the middle mark is difficult. Given the choice, I would go for the light greys.
Consider using a faster film in future - Ilford FP4 is ideal for almost everything, and HP5 performs best on overcast days.
I use Pan F because I have so much of it (several bulk rolls in fact, all about 15 years old) resting quietly in my film fridge. When my stocks of this film are all used up, it will be bye bye to a film I won't use again and certainly won't miss.
Whatever your decision, best of luck to you - but don't delay too long in souping your film.