It looks like you water dipped them as the amp draw is high for 2v. Clean the motor out real well and the amp draw should come down or just cycle from low to hi voltages and sometimes that will bring the amp draw down. Contrary to popular belief, a hi amp draw is not always good.
The motor turning 4,800 will probably tach out in the 12.4 to 12.5 range. The motor doing 4400 may not make it to 12k at 5 volts. You might try running your slower motor backwards for awhile, cause that will wake up some motors. I'm talking about a free run not water dipping.
Most of us test at 5v and 7.2v so when numbers are posted, They'll make sense or provide a useful base of comparison. The only reason I knew what those #s meant was that I do my first check on a motor at 2v.