That’s the Halacha. Matza is considered 讛谞讗讛 诇讙讜祝 even if you don’t like it. (讘诇注 诪爪讛 讬爪讛 诪专讜专 诇讗 讬爪讛)
Of course you are supposed to have kavanah the question is whether you can be yotzeh without it.
The entire drinking is one hemshech of kiyum hamitzva. There isn’t one gulp that takes you over the top.
The lomdus isn’t too complicated, if you need help ask the Lakewood bochrim that come to you’re shabbos meal.
(Btw the Ran is in RH daf 7)