Having some time spare I have been doing an analysis of your team for what it's worth.
GK - you have Darlow that will play and Mignolet that won't (I imagine). Darlow may get some save points. No point in wasting a transfer there.
D - You have 4 playable defenders - Valencia, Mangala, Gabriel, Cresswell. Nothing needed there.
M - With Sanchez, KDB, Payet, Hazard you have almost the perfect midfield. Iwobi may be benched but that is immaterial.
So that leaves the strikers. Aguero is fine. Deeney has always tended to be good in the springtime and is in form so he's fine. That leaves Carroll who is the one I'd shed.
You have 2.8m banked so that's 9.4m available. Options would be:
Giroud 8.7m - nailed on to start one would think with Welbeck injured and has a plum fixture. Only problem is no Arsenal slot, you'd need to remove Iwobi for a hit.
Lukaku 8.7m - has actually had decent goal threat recently according to the stats, has the Euros to prepare for and with Martinez gone Everton may play as if the cloud has lifted. Lukaku also has previous for goals on the last day of the season including a hat-trick a couple of seasons back.
Benteke 8.0m - less sure to start but pretty likely to one would imagine. Liverpool are still creative even when they rest players and their fixture isn't the hardest. Has scored a few recently.
Martial 7.7m - will probably play because the game matters and there is a week before the Cup Final. In good form but less of a differential maybe.
Alternatively you could bench Carroll and upgrade Iwobi, playing 3-5-2. Your 2.8m banked would bring
Tadic 6.6m within reach.
Those are the best options I can see. If it were me and taking a risk to make up 23 points were the only issue I'd go with Lukaku, he looks the most capable of getting a big score (which is what you need) I think. Alternatively I might bench Carroll, do Iwobi
Tadic and (c)KDB or Hazard. The captaincy can be a good differential too.
