Elastic scattering angular distributions for $^{10,11}\mathrm{B}$ + $^{27}\mathrm{Al}$, $^{28,30}\mathrm{Si}$ at ${E}_{\mathrm{lab}}=41.6 \mathrm{and} 50$ MeV, $^{10,11}\mathrm{B}$ + $^{28}\mathrm{Si}$ at ${E}_{\mathrm{lab}}=33.7$ MeV, and $^{11}\mathrm{B}$ + $^{28}\mathrm{Si}$ at ${E}_{\mathrm{lab}}=41.1 \mathrm{and} 42.1$ MeV have been measured. At each energy all angular distributions show similar oscillatory structure for $\frac{\ensuremath{\sigma}}{{\ensuremath{\sigma}}_{R}}>{10}^{\ensuremath{-}3}$, except for $^{11}\mathrm{B}$ + $^{28}\mathrm{Si}$, which is comparatively structureless. The inelastic scattering angular distributions of the first excited ${2}^{+}$ states in $^{28}\mathrm{Si}$ by $^{10,11}\mathrm{B}$ at ${E}_{\mathrm{lab}}=33.7, 41.6, \mathrm{and} 50$ MeV, and in $^{30}\mathrm{Si}$ by $^{10,11}\mathrm{B}$ at 50 MeV and by $^{10}\mathrm{B}$ at 41.6 MeV are presented. Relative direct transfer reaction strengths for $^{11}\mathrm{B}$ + $^{27}\mathrm{Al}$ and $^{11}\mathrm{B}$ + $^{28}\mathrm{Si}$ were measured at 49.5 MeV. The differences in the measured elastic scattering angular distributions can be explained by stronger direct transfer reaction channels in $^{11}\mathrm{B}$ + $^{28}\mathrm{Si}$.NUCLEAR REACTIONS: $^{27}\mathrm{Al}$($^{10,11}\mathrm{B}$, $^{10,11}\mathrm{B}$)$^{27}\mathrm{Al}$, $E=41.6 \mathrm{and} 50$ MeV; $^{28,30}\mathrm{Si}$($^{10,11}\mathrm{B}$, $^{10,11}\mathrm{B}$)$^{28,30}\mathrm{Si}$, elastic and Si inelastic ($^{28}\mathrm{Si}$, ${2}^{+}$, 1.78 MeV; $^{30}\mathrm{Si}$, ${2}^{+}$, 2.23 MeV), $E=33.7, 41.6, \mathrm{and} 50$ MeV. Measured $\ensuremath{\sigma}(\ensuremath{\theta})$, deduced optical model parameters and Si ${2}^{+}$ deformation lengths. Measured particle transfer cross sections, $^{11}\mathrm{B}$+$^{27}\mathrm{Al}$, $^{28}\mathrm{Si}$ $E=49.5$ MeV, ${\ensuremath{\theta}}_{L}=14.7\ifmmode^\circ\else\textdegree\fi{}, 18\ifmmode^\circ\else\textdegree\fi{}, \mathrm{and} 21\ifmmode^\circ\else\textdegree\fi{}$.