I would definitely get yourself a high temp thermocouple just so you can double check your temps, and as far as bevel angle you need to measure the thickness of the spine and also the measurement from the bevel to the the top of the grind line and plug it into the calculator on coticule.be and you will get the bevel angle, it also shows you what the angle will be with 1,2,3 layers of tape which is helpful.
In my experience you generally get a chippy edge when you have a high Rockwell hardness in conjunction with a really low bevel angle.
It's a bit like baking cakes eventually you will get your own recipe that works for you and your equipment and all will be good. Ed.