Yes, you might indeed finish up 30 deg off track - that's part of the design. So you then go round the hold again...to refine the holding track the next time inbound.
Trying to make good the inbound track after turning back to the beacon during the Sector 1 (Parallel) entry is going to be quite difficult in anything except low speed a/c which can achieve higher rates of turn than those which cannot achieve Rate 1 at 25 deg AoB. Hence wherever possible, it's best to ensure that you can navigate to achieve a Sector 2 join if approaching from non-holding direction! Usually achievable as the holding radial is normally aligned with the arrival route...and there's a 5 deg flexibility to benefit from!