Thanks for the reply.
It sounds like you are dealing with contaminated oil or sticking flow compensators.
Is the oil getting too hot? Do you have auxiliary circuits that are sticking? (Like extend-a-hoe or hammer valve?)
Did you replace all the valve's seals recently? Was any metal or other debris seen in the valve or oil?
Have you had any major failures in the hydraulics recently?
Do you have pressure gauges to check pump and signal pressures?
As far as the boom raising, is the boom able to lift the machine off the ground and hold it without drifting?
Do any of the cylinders drift loaded or not?
When you say controls are tight, do you mean they are stiff even when the machine is off?
Or do you mean they get tight when operating and are pushing back against your hand?
I am sorry, I still do not understand what is happening to your machine. I will OPT-OUT so others can see your question.