Hello all
So I have a home built in 1979 and no major update to house. I was having water come out of the spill way when the shower was turn on but hade good water pressure , but the water linked when tub/ shower was turns off. Water linked from the spills way. I fixed the lleak by replays sing all the seals on all 3 nobs , but now the center diverted nob dos not divert water vary well , no presser at shower head. The shower valves are p- p . I was thinking it maybe how the valve is scrowed in , like I'm not lining up the insides right. I can't find any thing that talks about this exactly, so help please

P.s sorry for the bad spelling