Generally wee chris seating deeper creates "less" pressure...
And lapua brass should deal with more pressure...
Theres probably something else going on thats not quite right!
Such as excessive neck tension or seeing as you necked down that brass your neck might be squishing in the throat or there may be abit of crap in there causing it to squish..
A good scrub in the troat area and maybe a neck turn could make all the difference...
Also id assume 2209 abit fast for a 162 in a wee 308 sized case maybe try some 2213SC or summin abit slower than that even N165???... The fact that your filling the case before book max and probably getting slow speeds and pressure early says alot for your powder cjoice
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