Yes, as suggested, BB Hack squats are excellent for the quads. Some will have the heels raised on a 2X4, plates,etc for increased focus on the lower quads (tear drops) And with Romanian DL's, the hams are getting their fair amount of work. The Romanian DL has been know to increase one's regular squatting power also. They also give the lats/traps a good stretch and involvement in the exercise. I would mention squat cleans but don't think your going in that direction. A top mass and stamina build for most.
Might also consider working the legs one at a time for awhile. As Bulgarian squats, which many believe is better than the regular front lung (personal choice for any of us). Also the step-up, which also hits the hams very well. Last by not least, the one legged squat. Suggest using DB's for any of these, rather than a BB.
The higher the angle/incline raised from a flat bench, the more the delts become involved. Saying that, you will be getting more of a front delt/upper chest tie in with inclines (but your still working the lower pecs fairly hard also..can't take them out of the picture).. If you using a BB with inclines, might suggest trying DB's for a change of pace. Should be getting a better stretch and new feel to the upper pec's. If a certain incline degree doesn't seem to be doing it for you, that try adjusting to a different angle. With lifting, a few inches and the way a bar is gripped can sometime make a whole lot of difference.
I've seen guy's switch from the bench (flat or incline) to dips and watched the following improvement they made. Seems to be more kind to the elbows, for most. If haveing a "V" bar to preform the dips on, so more the better. Feel free to add more weigh from time to time, as with the bench press.
Good Luck.