Hi Foxy,
well done on the job so far!
First, let me say, that I think you are being a bit harsh on your D6. Newman is the 5th highest scoring Def in the last 5 weeks! His 3 Round average is only 6 behind Laird's and Adams'. You have positions leaking a lot more points than that!
The way I see it, you need another Mid, 1 or 2 Rucks, and 1 or 2 Fwds. With 10 trades, that's problematic, if you want all 5.
You have Barrett and SPP that can be culled now, but your other Rookies are going to need a few weeks, before they're ready. This also becomes a bit problematic, as you need to complete your team in a timely manner, or you facing an uphill battle to maintain your Ranking.
I think R2 is your biggest problem, and Witts to Goldy doesn't fix that. Also, Witts' form is actually very good! Prior to last game, where he got monstered by Kreuzer, his previous 5 scores are all in the 96-115 range (ave 103). Nank's last 5 are all in the 72-100 range (ave 84). If you had a stronger Forward line, you could look forward to getting Nank to F7, as cover for your Rucks, but you don't, so I think you just have to wear that he's gone! Look at it this way, with your current Fwd set up, it's actually Pickett or Bolton that's covering your R1/R2's score, if they miss a game. You can get from Nank to Goldy with $92,100 this week, and I suggest you do it. If you get caught for some reason, and can't do another Ruck upgrade, Goldy/Witts is a lot stronger than Goldy/Nank! Goldy is in less than 10% of teams, though that will rise this week.
I think if you are entertaining Witts to Gawn in a couple of weeks, you need to let Lloyd go. I think you might possibly strike a problem or two completing your Fwd line, especially if that includes upgrading Higgins. I think I'd set your Mid (E) on SPP, and go Berry to Witherden this week. I know it early for Witherden, but if he plays it's a bonus. He's the best M/D FD you can get, as far as the Draw goes.
I think you need to fix some leaks, before getting some "luxury" cover. If you're sure you want Lloyd, I guess you grab him with your 2nd trade, but I think it's the wrong move to achieve your goal.
Either way, good luck which ever way you jump!