Always take advantage of the opportunity of providing names of potential reviewers if requested to do so. Make sure that suggestions will be acceptable by selecting individuals sympathetic to the proposed approach and not selecting individuals with whom the PI has either published recently or has ongoing research activities. Many agencies have become very concerned about overlap between grants. Even if not requested, providing summaries of the other grants in order to demonstrate the lack of overlap can help. Long sentences, complex phraseology and jargon do not reflect scholarship.
Reviewers are over-burdened with many applications to read and assess.
It is always easier to read an attractive and well laid out grant than one that is densely packed or printed with small or hard to read characters. Make sure to read over your application several times. Ask a colleague to proofread your application. Perhaps the single most important rule of grantsmanship is that the applicant should have at least one, but preferably two or three, colleagues read and constructively criticize the application . Try to ask individuals who have sat on grant review panels recently.