`10 FE390 valve clearance question

I've tried search, but did not come with a definitive answer, so here I go.

`10 FE390, around 190 hours, just acquired recently, don't know if valves were checked before, this is my first check, measured values are:

(IN should be between 0.10 - 0.15mm)
IN#1: between 0.13 - 0.15mm (ok)
IN#2: between 0.15 - 0.18mm (not ok) (0.15mm feeler drags)

(EX should be between 0.12 - 0.17mm)
EX#1: between 0.13 - 0.15mm (ok)
EX#2: between 0.15 - 0.18mm (not ok)


My question, what part of the accepted range is more desirable, the tighter or the looser?

So while IN#1 is ok, closer now to the 0.15mm looser limit, should I install a larger shim to be closer to the 0.10mm tighter limit?

Which shims would you change?

Many thanks for the help.

Thanks. Can I assume the valves will get tighter over time? As the valves seat in more.

How do they get looser? Wear on the rockers or shims? Is it worth trying to flip the too loose shims?