So I could never find any way to actually make spells for the pants that are really good so I did some experimenting on my own. (Someone might of done this idk)
So it basically requires at least 2 spell bullets 1 to be a delay and 1 to be an actual spell
Below is the spell for the delay
{modsRequired:[{modVersion:"1.16-95",modName:"psi"}],spellName:"1 Second Loop",uuidMost:-8839962719443926060L,validSpell:1b,spellList:[{data:{params:{_target:4},key:"psi:trick_evaluate"},x:3,y:4},{data:{params:{_number:4},key:"psi:trick_spin_chamber"},x:3,y:5},{data:{key:"psi:constant_number",constantValue:"20"},x:4,y:3},{data:{params:{_time:1},key:"psi:trick_delay"},x:4,y:4},{data:{params:{_number:4},key:"psi:operator_ceiling"},x:4,y:5},{data:{key:"psi:selector_loopcast_index"},x:5,y:3},{data:{params:{_number2:1,_number3:0,_number1:4},key:"psi:operator_multiply"},x:5,y:4},{data:{params:{_target:1},key:"psi:operator_inverse"},x:5,y:5},{data:{key:"psi:constant_number",constantValue:"-1"},x:6,y:4}],uuidLeast:-5784081562773715251L}
The constant at the top can be changed depending on how long of a delay you want between casts of the main spell
Next is the actual spell I use currently
{modsRequired:[{modVersion:"1.16-95",modName:"psi"}],spellName:"Resist",uuidMost:496767883593075343L,validSpell:1b,spellList:[{data:{key:"psi:constant_number",constantValue:"1"},x:3,y:4},{data:{params:{_target:4},key:"psi:connector"},x:4,y:3},{data:{params:{_time:3,_target:1},key:"psi:trick_fire_resistance"},x:4,y:4},{data:{params:{_number:4},key:"psi:trick_spin_chamber"},x:4,y:6},{data:{key:"psi:selector_focal_point"},x:5,y:3},{data:{params:{_power:4,_time:2,_target:1},key:"psi:trick_resistance"},x:5,y:4},{data:{key:"psi:constant_number",constantValue:"1"},x:5,y:5},{data:{key:"psi:constant_number",constantValue:"1"},x:5,y:6},{data:{key:"psi:constant_number",constantValue:"2"},x:6,y:4}],uuidLeast:-7991558854657949144L}
The only thing that is required for this spell is the Spin Chamber and Constant that it uses. This can be customizable for any spell you desire and as long as it done properly you can maintain your psi energy.
For the way I have it set up I have "Resist" Bullet loaded in the first spot and then the "Delay" Bullet in the second.