1) prosecution =/= litigation or IP transactions. The PhD will arose a lot of interest for prosecution in and of itself, but for lit or trans work it's more about law school attended + law school grades in the beginning.
2) getting your PTO bar number before you look for 1L summer jobs is huge! Someone will take a bite, b/c a busy group will actually be able to make money off of you for the summer unlike most of the other summers.
3) even if you really aren't interested in prosecution, try to find a prosecution group in the area of your law school if possible for the 1L year. You will have a chance to work your 2 and 3L years making some decent cash at the place you summered as a 1L or possibly another shop.
4) be prepared for firms to only want you for prosecution. you can immediately make them money and they know that. if you want to do litigation or transactional work in the tech sector, you'll have to fight, perhaps harder than a non-phd, to get experience in that area.
5) if you work for a big firm as an associate, you can't do primarily prosecution for an entire career. the numbers just don't make sense b/c you'll price yourself out of the market. eventually you'll be doing lit support (ie claim construction or infringement opinions), trans work (ie due diligence or licensing), or bringing in clients for junior attorneys. Or you'll go to a boutique where the overhead is lower.
6) you should target schools in areas where there's a lot of IP patent work going on (in no particular order): Boston, NY, DC, Chicago, SF/SV, and San Diego.
7) since you've got the phd, I wouldn't worry so much about the GPA. You can't do anything about it and it's a long time ago. just do your best on the lsat and get some good recs from people who know you now.
you could even consider a PT while working as a patent agent during the day. Personally, I'd worry about getting into school first than worrying about finding a job. but there are shops that'll pay a good bit of your tuition in addition to a salary. But be wary of any contractual obligations to work for them after you graduate.
9) the school you go to and the grades you get in law school will matter. But a phd + jd is a pretty rare combo so that in and of itself will open some doors b/c IP groups are one of the most profitable groups in a firm right now.