As above the bands in the main chamber are for stopping it bottoming out, so only add them if you doing so regularly, & if your now struggling to get to use full travel, remove them one by one. Also as mentioned the Debonair sleeve needs much higher pressure due to the greater negative spring volume, so you also need to make sure you equalize the negative spring as you pump it up.
Remove all the air and then inflate to 100psi, compress past the sag point a few times to charge the negative spring, then inflate to 150psi and compress past the sag point etc. keep doing this and increasing the pressure until you get correct sag.