jogging speed limited to 4000mm/m

hi guys, ive setup my machine, its a printnc with a work area of 1220mm x 1220mm my setup is as follows, im using dm542 drivers with nema 23 stepper motors with a 48v power supply, set microstepping to 1/10 and im using a parralel port breakout board, and im using the axis gui, the machine is capable of 8800mm/m  on the X and Y axis but when i jog after homing and putting the slider for the jog speed to max which is 8800mm/m the dro only says 4000mm/m and wont go any faster, i have uploaded my hal and ini file as i tried after reading the hal and ini basics pages and changed some values but it made my machine overtravel so im a bit dubious about messing around too much without some help, any help would be appreciated

im using 1610 ballscrews with nema 23 stepper motors directly driving the ballscrew, pulse/rev on drivers is set to 2000, they are 1.8 degrees per step x 200=360 degrees. is this what you were asking, i set it to 1/10 microstepping to get better resolution, 1 full revolution of the ballscrew moving 10mm giving a 0.005mm of movement per microstep

There are settings under [DISPLAY] in your ini file  that affect jogging max velocity

ok i changed those values but when i go over 75 i start losing steps or it doesnt travel the correct distance, if i change the MAX_VELOCITY = 67.8571428571 to anything above 75-80 and if i dont lose steps it doesnt travel the correct distance across the axis. im just editing the x axis trying to get that to speed up, at 80 i dont lose steps but when i move to the X1236 with the jog key, (arrow keys on keyboard) which is my axis limit, after changing the value it only moves to like 8-900mm across the axis if i jog with the keyboard, and returns back to where it homes in the correct place when using the keyboard to jog it back to 0, but at 67.8571428571 it moves the correct distance. i checked my driver settings and im using 2000 pulse/rev. 1/10 microstepping is this the cause? (edited)

   thanks tommy very informative, im using dm542 drivers with a meanwell 36v power supply and nema 23 steppers, im supposed to be running at 4.2a peak 3.0a rms but checked my wiring and im actually running them at 2.84a peak 2.03a rms. the stepper motors and drivers came with a kit i bought from china for the cnc, the tutorial for the kit says to run them at 4.2a peak 3.00a rms but the mounts for the steppers are 3d printed so advice is to tone it down a little till you can mill some metal ones but my setting seem a little low, im using the half current at idle setting on the drivers so they dont get hot at idle, 57hs10030a4 is the model of driver and ive uploaded the spec sheet. i was thinking that others have used 1/5 microstepping 1000 steps per revolution with the same kit , so i was going to change to the higher setting of 4.2a peak 3.00a rms and change to 1/5 microstepping as i think the controller board which is a cheap parallel breakout board is what is struggling to produce the 2000 steps, so if it can cope at 2000 pulse/rev for 4000mm/m it should be fine at 1000 pulses/rev at 8000mm/m the extra voltage may help also, but after what you said im only going to be cutting wood, some hardwoods and maybe some aluminium and mild steel at some point, i need to mill some aluminium stepper mounts and if 4000mm/m is enough for my needs then ill leave it as is, if it aint broke dont fix it, when i have better motor mounts made im going to make a new config in stepconf and up the driver settings to the 4.2a peak 3.00a rms, and change to 1000 pulses/rev just to see if it is the breakout board thats the caveat, and if theres any differnce in cutting quality from 2000 to 1000 pulses per revolution, as i thought 2000 pulses per revolution would make for finer details and rounder circles ect being achievable instead of switching down the line, thankyou again for the info and taking time to reply i appreciate it, also thankyou rodw for taking a look, 

In my view, 36 V is too low. replacing the PS with a 48v one would make a difference and not bother the DM542's
Buying a second 36 v power supply in series to give 72 volts would really give performance a lift but you'd need different drivers.