I have a supply of Neptunes Harvest fish/seaweed fertilizer in liquid form. Is this product adequate for in ground figs as well as rooted and growing cutting? Thanks to all.

I haven't used this brand, but I have used other fish based fertilizers.  What I have learned is this..

1) Smelly
2) Easy to have negative results on containerized plants, the smaller the container and younger the plant the more sensitive it is. Even at greatly reduced ratio's.
3) If you use it outside on in ground plants a few times throughout the summer starting at or right before bud break, the results are very good.
4) After you fertilize every blow fly in a 2 block radius is scrambling around your yard looking for the dead fish. This lasts about a day, and you can still smell it for a couple days.

What type of potting mix are you using? If it is peat/compost based, yes: if it is bark based, no.

My rooting mix is perlite, vermiculite and coir. When I plant in ground, I remove all native soil(piss poor clay) and then backfill with homemade compost. And heavy mulch.

Coir also has a high cation exchange capacity *I think, as does vermiculite. So it should work out OK for you. The problem with organics in containers is that they are flushed out before bacteria and fungi are able to convert them into a usable form for the plant.

With an NPK of 2-3-1 you might want to consider adding a high nitrogen source early in the season, and then giving additional potassium during fruiting. A top dressing of compost might do the trick.

If you are planting out into compost you should not need to fertilize the first year, and clays tend to be high in potassium and phosphorus so a little nitrogen or top dressing of compost should be all you need after.

I use fish fertilizer on my figs, my mix has been 50% coarse coir and 50% composted sheep manure.  I have had no problem to apply it on my trees at label rate and even triple rate, it's not the same brand nor would I advocate to use more than label rate.  The thing with coir is that in general it has a high potassium level, I don't know if that is concern for you or not.