*Front loading, long term as far as the cycle goes it won't do anything for you. The success of the cycle will not be affected by front loading or not.
*250mg/wk is on the low end, closer to HRT doses but more than likely more than you're making naturally. Results from the test may not be dramatic, how you eat will greatly determine this but there's no reason you can't grow from this cycle, especially with the added dbol. I do agree though, 500mg/wk would be better.
*Taking nolva while on cycle might keep the gyno monster away, you may not need it at all though but a little nolva won't hurt anything. If you end up being sensitive to gyno and there's no way to predict this, nolva will not be the answer. In this case you'll have to get an aromatase inhibitor.
*HCG, yes it will keep your balls fuller while on cycle, is it necessary? I don't think it is. Yes, it will stimulate testosterone production and increase testosterone levels but only slightly. Further, you're not really keeping your natural testosterone levels alive, this is a myth. HCG has the ability to mimic LH not replace it...your thyroid is not going to be fooled. IMO, HCG is best used post cycle before nolva and or clomid therapy. If you decide to use it, start pinning HCG 10 days after your last shot and inject it every day at 1,000iu per day for ten straight days. Follow that with nolva or clomid.
*Nolva or clomid for PCT, either is fine. MG for MG nolva is stronger but in the end, adequate doses of either will work. 4wks of therapy using nolva or clomid after the hcg will work well.