This late in the game I would just sight in for broadheads and practice with broadheads - assuming they are grouping fine. If your broadheads are not grouping, then you have to tune.

By the way, if you are looking for a broadhead that is very similar to slick tricks try the muzzy mx-4. They fly the same as my slick tricks and have very similar construction (the blades lock together inside the ferrule). The nice thing about muzzy mx-4's is you can buy them anywhere unlike slick tricks. The only problem is they don't come in 125 grain.

I've used those Eastman 4 blade 125's you have. I snapped the blades off just from shooting into my yellowjacket target. The blades are very thin and the way they connect to the ferrule is shoddy to say the least. If the Magnus fly okay I'd definitely use them over the Eastmans. Good luck.