STX 535 quad powershift question, is this normal?

I have a 08 quad I just bought and it seems to shift weird especially when it skips gears, very noticeable from 6th to 8th and from 8th to 10th. If I shift one gear at a time the problem still is noticeable but not as much. When it shifts there is a lag, it seems as though the driving clutch pack disengages and the re-engaging clutch pack doesn't take hold soon enough and I feel a rough shift. The trans has been recalibrated twice and it doesn't matter if its under a load or not. Shifting in the upper gears seems very smooth. The shifting in the lower gears is no where near as smooth as my 05 325 and 450. Could a shift solenoid be bad? The trans doesn't seem to slip, it pulls an 11 shank 870 and packer just fine, its just got that delay in between shifts that doesn't seem rite to me, but I know its got different software than my other tractors so I'm not sure if this is normal. Any input would be appreciated. Thanks

STX 535 quad powershift question, is this normal?