I've got a midi and a Kapex. I used to use it with a 27mm hose and it was ok... I then upgraded to the 36mm hose - totally different. Not perfect, but pretty close.
I would upgrade the hose to 36mm, see if that's good for you (was for me). Then if it is not and you upgrade the vac, you can use the new 36mm hose instead of the 27mm one.
So, you try with something cheap, before having (if you feel you need to) to upgrade. If you do upgrade you will reap the benifit of the 36mm hose - everyone's a winner !!