SSF: How to get beachhead maps for Harvest Harbinger challenge?

What are people's best ways to get beachhead maps in SSF?

This challenge is the one I'm struggling with most.

Farming on FB_GG_Melee_is_pants in my profile which is pretty fast but without any iiq .. As I want to use him to get to my first lvl 100 in this league whilst I do this... I switch to my 95 Jugg for Sirus and Vaal temple bosses if conqueror spawns there.

I'm currently farming Shore, Strand and Lighthouse for The Landing and The Journey.

The landing seems to be rarer than exalted orbs, whereas the Journey has a higher drop rate it probably works slightly faster.

I'm running Harbinger on most maps in Shore and Lighthouse with Betrayal to farm Cimeria in Fortification for Harbinger .. but i'm running out of Juns.

Harbinger shard drop rate from Harbingers is ridiculously low ... dumb GGG .. you get 5 times more harbinger currency from other sources than you can get from actually running Harbingers.

I run Legion on Strand hoping for foreboding incubators .. but they aren't common and Legion is expensive... possibly could farm Dunes for better Legion procs .. but wouldn't get the harbinger div cards.

I pop in the odd Promenade with Metamorph to keep the ilvl 83 on Alva temples which I pop on Conqueror influence maps, and ilvl 83 Betrayal encounters for xp in my grind to 100.

Metamorph harbinger items are extremely rare it seems .. Legion seems to drop foreboding incubators and chests more often.

I run Blight maps when I can with crimson oils but again the harbinger currency is not that common even in these.

I'm also using whatever divination scarabs I can get from Gravicius when running Shore or Lighthouse.. I save Gilded or Winged for Beyond Conqueror influenced maps ( single delirium orb if I have one).

I have up as many tier one harvests as I can without gimping harvest throughput to pop on maps where I run a divination scarab.

I only use the Harvest craft to try for a infused beachhead on duplicate pieces. I tried harvest craft a full cloth belt but it only gave me a normal beachead. I have yet to get an infused map from about 10 pieces and one completed belt. I have 5 Harvest crafts saved as I'm trying to build complete items until I actually get a scroll then I can use the harvest crafts on every other piece to farm the item I need if I don't already have it.

Please if anyone has any ideas above what I'm already doing, please let me know.

Is it worth me sticking on about 50%of IQ gear and farming lower level Shores/Lighthouses for a day or two.. which will frustrate my levelling to 100 and my Sirus end game grind.

Brother in SSF, stuck with same bullshit here. I have 2 scrolls for upgrading a Harbinger unique so far, one for staff, one for quiver. Sextants + Harbinger mod on Crystal Ore is what I try. The Landing isn't worth going for unless you try to gamble the Casino. Legions are an extra at 10% per map / sextant mod. Scarabs help but aren't available so much

It's a pain