Yeah, I'm getting used to it now.

When changing down gears, say from 4th to 3rd, clutch in, jab the accelerator to bring the revs up to the correct amount for the gear/speed while moving gear stick to 3rd and let clutch out for a smooth gear change. When pressing the accelerator to bring the revs up, the engine rpm only increases around 400-500rpm instead of 1500rpm or higher, no matter how hard I press the accelerator. This only happens sometimes, but it's more often than not.