Your home-made valve tool obvious doesn't work like the real thing or the keepers would stay put.
Try a thicker block of wood. You don't to see any movement in the valve at all.
Once the spring is compressed the keepers will tend to stick to the valve. Use a sharp scriber to spilt them away from the valve stem then a sharp joggle to pop them free. Put the keepers, retainer and spring in a MARKED box and stone the edges of the keeper-grooves. In use, the keepers will generate a feather-edge of metal at each groove that will ruin you valve guides unless removed.
After removal, the wiggle test will usually show the intake GUIDES are within spec (they wear at about half the rate of the exhaust guides.
-Bob Hoover