If I’m reading this correctly, you’re trying to get up to 260C - correct?
First off, this seems to be out of spec for the CR-10; from what I can see in a search, the printer has a maximum temperature of 250C. Are you sure the power supply can pump out enough current to get the hot end up to that temperature, hold it and run other functions (with the heated bed being a big one)?
If this were normal Klipper (not the forked version in the Sonic Pad), I would suggest you add a [verify_heater extruder] statement like what I use on one of my printers to allow the extruder to get beyond 250:
[verify_heater extruder]
#max_error: 120
# The maximum "cumulative temperature error" before raising an
# error. Smaller values result in stricter checking and larger
# values allow for more time before an error is reported.
# Specifically, the temperature is inspected once a second and if it
# is close to the target temperature then an internal "error
# counter" is reset; otherwise, if the temperature is below the
# target range then the counter is increased by the amount the
# reported temperature differs from that range. Should the counter
# exceed this "max_error" then an error is raised. The default is
# 120.
check_gain_time: 50
# This controls heater verification during initial heating. Smaller
# values result in stricter checking and larger values allow for
# more time before an error is reported. Specifically, during
# initial heating, as long as the heater increases in temperature
# within this time frame (specified in seconds) then the internal
# "error counter" is reset. The default is 20 seconds for extruders
# and 60 seconds for heater_bed.
#hysteresis: 5
# The maximum temperature difference (in Celsius) to a target
# temperature that is considered in range of the target. This
# controls the max_error range check. It is rare to customize this
# value. The default is 5.
#heating_gain: 2
# The minimum temperature (in Celsius) that the heater must increase
# by during the check_gain_time check. It is rare to customize this
# value. The default is 2.
The check_gain_time parameter will extend the time interval used to determine whether or not the specified heater is increasing in temperature or if it has stalled out.
If the [verify_heater extruder] statement is available in the Sonic Pad then I would recommend trying it but no more than 2.5x the default value because the function of this feature is to ensure you don’t burn out your power supply drawing an excessive amount of current for an extended period of time.