French tuning or modified French tuning gets your windage set. It’s usually where you start and not as advanced as bareshaft and broadhead tuning. If it worked for your windage with the broadheads that’s fine but all you needed to do was move the rest to have the broadhead tipped arrows and field tipped arrows groups converge. That’s assuming they did/do at all ranges. If they don’t you need to spend time on the bow (usually yoke tuning) or your form but regardless let’s assume you got that correct.
For the vertical separation it’s one or the other (rest height/nocking point). You typically set the rest/nocking point so the arrow is lined up with the Berger hole and then play with the rest height in small increments and only move the nocking point again if nock travel is an issue and you don’t want to tune it by adjusting individual limb weight or an individual draw stop aka because moving it is the right thing to do because it’s in the wrong position. In your case, if your unwilling/unable to move the rest you can try tweaking the nocking point. If it’s wrong your going to end up with a nock travel issue that you probably won’t tune out and you’ll need to put the nocking point back where it was. If it’s correct, you’ll get the result you want and it’ll be happy hunting.
Broadheads were hitting higher then field tips so either move your rest down a whisker or move the nocking point up a hair. If it doesn’t work, put it back and adjust the rest.
Have you checked all the fundamentals first? ATA, brace, draw weight, let off, cams are timed and synced, draw stops hitting correctly, cam lean, etc? Not a big deal at this stage of the game because the end goal is to get hunting and you might achieve it with a few rest movements but to be properly tuned and to have a forgiving tune these are things you need to look at next year.
Bow tuning is a bell curve. There are tunes that give acceptable results or use techniques to disguise problems but they’re less forgiving then a tune that’s “correct” and as forgiving as possible. A well tuned bow can shoot huge broadheads with minimal fletching and tolerate some form issues and still stack arrows exactly where they’re supposed to go. A poorly tuned bow can still put all the groups on the point of aim but it requires perfect form, more fletching and is for a lack of a better term “touchy”.
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