True, the rack type does make a difference, a big one sometimes. I hated the old Sardo Tight rack. That thing was a monstrosity! The Delta 13 might be the best triangle rack ever. I also like the hard poly fiber racks. You could really snug the balls up there with that one. Wood racks, only so so. Even the Diamond wood rack is average at best. Plastic racks I throw away!
The templates they are using today also vary somewhat, with some working better than others. Among those I like the Accu-Rack the best.
One other thing Stu. Placing the rack in the right place on the spot is also important. Sometimes the spot gets worn down and there is a slight divot. I don't want the head ball in that divot, so I may move the rack up just a hair to avoid it. Bingo, I now have a tight rack. Also, the cloth must be smooth and clean! You can use a rag or towel to wipe it down but often I would use my hands to give it a good rub down before racking. That always helped. I can't tell you how many times I had a fellow ref that couldn't get a tight rack, and I would go over there and give that cloth a good massage and just like that they would rack right up.
For me, getting a tight rack was paramount, especially in 9-Ball. Seems that most refs today are unaware of these things.