As long as you are catching fish with what you are using, use it.
On my 7wt's I fish 480-570 grain compacts with tips up to 170 grains depending on the rod. For bigger tips I'll drop down a line weight with the head in order to accommodate the load.
I have always wondered if the rod "cared" about the difference between a 600gr skagit 75 grain tip, or a 550gr skagit with a 125gr tip. My hunch is NO.
I see a lot of guys fishing smaller water, or even bigger water where its not necessary to make a 1,000 foot cast, fishing 9 and 10 weight spey rods. To each his own, for sure, but I just don't find it enjoyable to throw a 14 or 15 foot rod around all day.