New Eaton tower stiffness

Hi all,
Some time ago I converted my (RT016910C AS2) Eaton 10 speed Auto shift to manual with stick shift. In short: to do this I bought new top plate and used lever with tower from 13 speed I bought earlier. Tower had some free play and was worn so I decided to buy new tower for new top plate. On old tower I could shift gears with one or two fingers, but new tower is stiff. New tower fits perfectly, I can move lever left and right but sliding it into gear, especially 9 and 10 requires some force, definitely won't do that with 1 finger anymore. Bushing between lever and tower was also replaced.
Transmission is in perfect condition because it was replaced before I bought truck, shift clutches are perfect and gears aren't worn at all.
New tower complitly disrupts my smooth shifting, I have to double clutch more often.
I've never had brand new truck with manual, newest I ever had was with 70k miles on it and stick was just fine.

Now question for some old experts: How many miles I have to put on this tower to be less stiff? Maybe I need to spray some lubricant like wd40 on top of stub lever?

If this continue to be like this I would rather put old tower and have smooth gear changes.