Bigger boat appears to be a small issue.
We now only have three squadrons of embarkable aircraft. (Soon to gust to four, but with no extra planes.) For a fair portion of the year they have better things to do with their time than embark. (Small but very important on going Op etc). Now i know they take the Queen's shilling but if you spend 1/4 of your entire life on Ops in an austere environment, then there's only so much boat time that you can stomach. Oh and then there's Flag etc.
If we can't find aircraft to fill up a CVS, then we've got issues. Purely talking personnel - school leaver to frontline = five years, so there won't be a short term fix. And just to draw in another argument it's not going to be won or lost by a blue badge on everyone's left arm.
Two 'RN Heavy' squadrons out of four able to embark is simply below critical mass for a nation that wants a Maritime Strike capability.