Based on the total ratings provided, here are the rankings:

1. Evania (Total Rating: 422.8) – This unexposed mare has a good record on all-weather surfaces, with a course and distance win to her name. Despite her heavy defeat in a Listed race at Goodwood, she shouldn’t be judged too harshly, and there’s still scope for improvement in this sphere.
2. Sea King (Total Rating: 414.2) – A promising young horse, Sea King demonstrated respectable form in his last handicap at Newmarket. This race will be his polytrack debut, and given his potential, he is one not to discount easily.
3. Civil Law (Total Rating: 372.1) – With six wins from his twenty flat runs, Civil Law has proven his competency. He showed decent form in his last race at Chelmsford City and is worth considering for this race.
4. Cemhaan (Total Rating: 370.5) – A three-time winner last season, Cemhaan was perhaps in need of his recent run at Newmarket. With a drop in grade and past success at this course, he should not be ruled out.
5. Barenboim (Total Rating: 363.2) – With five all-weather wins at up to this trip, Barenboim has been in fine form. His last run on turf was disappointing, but he could bounce back here on the Polytrack.

Now, focusing on the additional considerations based on positive comments, despite their lower total ratings, a few horses deserve attention:

• Balhambar (Total Rating: 327.0) – This horse improved with each of his first three starts last spring, winning a maiden at Chepstow on the third occasion. He still has plenty of potential, and although he has been off for 11 months, he might surprise.
• Shockwaves (Total Rating: 313.0) – His recent career-best win at Lingfield, easily taking the 8-runner handicap, stands out. A significant step up in trip could be a challenge, but if he gets home, he could still do better.
• Protected Guest (Total Rating: 359.5) – Despite his unreliability, Protected Guest put up a creditable performance in a handicap over course and distance three weeks ago. He could be worth considering.

To conclude, based on total ratings and other considerations, Evania, Sea King, and Civil Law appear as strong contenders. However, Balhambar, Shockwaves, and Protected Guest shouldn’t be disregarded due to their potential for improvement and recent good performances.