They seem pretty realistic to me, you're in a similar (actually better) situation to what I was in last year. In my AS year I achieved BBBE, with my B in English being 1 mark from an A, and the other two B's were just solid B's, and then I dropped Maths (E) because I hated the subject with a passion. As for your predictions I think you should be fine really, from my grades my school predicted me ABB but after speaking to my teachers I managed to get it raised to AAB and got offers from everywhere I applied (Nottingham, Leicester, Loughborough, Keele, Uni of Birmingham). By the sounds of it you're applying to similarly ranked universities as I did and since you did better than me I see no real reason why you shouldn't be able to get into them!
As for resits and remarks it's really up to you. Personally I didn't bother with the remark for my English because it's all about the examiner's interpretation of what you wrote really and I didn't really wanna risk lowering my grade, I just looked at it more as 'Okay, I need to get 1 mark into an A next year to get an A overall'. In the end I resat one of the English exam's I got a B on but when it came to the exam period I was that busy with other exams I didn't really have time to revise for it and I ended up with a B again, but I got the extra mark this time! I also resat a Biology and a Film module as I figured it was worth a shot to improve my grades and take the load of my A2 results a bit. My Biology didn't improve (again I didn't really have time to revise) but my Film exam went from a medium B to a high A, but honestly that was because I put a lot of effort in and essentially retaught myself the whole year with new films and no help from my teacher to push my grade up to the A I needed for A2. So resits are definitely worth it and can be really helpful to scrape your grades up those extra few marks that really matter, but you need to consider how many exams you are going to have already and think will you really be that interested in revising for an exam you already have a solid grade in when you could be revising for exams you are yet to be graded in. Honestly, by the sounds of it I think you'll be fine so congrats on your results and good luck next year!