fix zjerk being the same for delta as xy jerk

add more delta defaults
on delta make second home even slower

Marlin/Marlin_main.cpp

@@ -712,7 +712,11 @@ static void homeaxis(int axis) {
     st_synchronize();
 
     destination[axis] = 2*home_retract_mm(axis) * home_dir(axis);
+#ifdef DELTA
+    feedrate = homing_feedrate[axis]/10;
+#else
     feedrate = homing_feedrate[axis]/2 ;
+#endif
     plan_buffer_line(destination[X_AXIS], destination[Y_AXIS], destination[Z_AXIS], destination[E_AXIS], feedrate/60, active_extruder);
     st_synchronize();