Problem 1 is easily solved, turn down the levels.
Problem 2 is more likely your bass has more output on E and A strings, you'll have to learn to control it and/or raise the pickups on the G side.
Gettting the sensitivity under control should help a bit, making you dig into the D and G to get it going, if that is too loud repeat level control.
Team Trace Elliot #1, Mediocre Bassist #399, Old Basstard #86 Kala U-Bass #22
Swamp Kauri custom 5str. Stagg EUB. Krappy 5er FL.