I have a low capacity 12 wheel. In heavy crop you need to widen out the back and narrow in the front. If you chage the witdth of the front (the width of the v) you will need to change the width of the back (the ratchet binder looking adjustments). As you narrow the v width setting you will need to reduce the rear width setting as the rake naturally opens up that width. The biggest thing for making sure you pick up hay is having all the teeth in. Even though there are a zillion teeth, if quite a few are missing you will loose a lot of hay. Pressure on the tines will also help. More pressure means a cleaner field and more teeth to replace. I have not found a happy medium just yet. Also, don"t buy cheap teeth. Someone did in my rake before I bought it used. I figure another 2 years and I will have them all replaced.
I love my v-rake because I can rake 3 10" swaths together if needed but it can be an agrevation.
Also it it plugs up, close the v most of the way, pull forward a few feet and spread it back out. Clears it every time. Not that I ever plug up.